Knowledge Base

  • DS-Series LNT computer

    The patented LNT (Level North Technology) of the DS-Series scopes includes an electronic level sensor, an electronic magnetic North sensor, and a high precision internal clock. These components combine with the Level North Technology software in the built-in Autostar computer to make aligning on the sky as easy as remembering your own zip code. You don't have to be able to identify stars like Altair or Zubenelgenubi or know how to read a star chart to line up your telescope on the sky.

    Simply take the scope outside and set it up on its supplied tripod. The internal clock keeps track of the time and date, so there's no need to tell the scope the precise time when you turn it on. Also, the scope will remember your last observing location, so there's no need to reenter that information if you're observing from the same site. If you're observing from a different location, simply enter the city and state you are observing from - or just your zip code!

    The scope will then use its built-in level and magnetic North sensors to level the optical tube and point it north. The internal clock will tell the software the correct time. The software will determine where and when on earth it is and what the sky looks like overhead. It will then move the scope automatically to its first alignment star.

    If the star is not precisely centered under the red dot in the SmartFinder non-magnifying finder, you can use the Autostar hand control pushbuttons to center it to improve the pointing accuracy. Let the scope repeat the process for its second alignment star and you're ready to start observing. It takes only a few keystrokes on the computer hand control to have the scope move automatically to your night's first observing target and start tracking it so you can observe at your leisure. You can find hundreds of fascinating deep space objects your first night out, even if you have never used a telescope before. The LNT system makes setting up a DS-Series scope fast and easy, and using it virtually foolproof.

    The Autostar computer hand control plugs into the telescope's drive base to permit a wide array of telescope options. First and foremost is its automatic go-to capability. The Autostar computer can show you the planets and hundreds of deep space objects the very first night you use your scope - even if you've never used a telescope before!

    At the push of a button, your DS-Series scope will move at a fast 4.5° per second to any of the 1471 objects in its database. You can choose from deep-sky objects including 66 named objects (e.g., the Orion Nebula); 74 galaxies; 31 diffuse nebulas; 19 planetary nebulas; 11 quasars; all 109 objects from the Caldwell Catalog of the best objects for small telescopes; and all 110 objects from the Messier catalog. You can choose from 863 stars; the 200 most interesting from the Smithsonian Astrophysical Observatory (SAO) catalog; 79 famous named stars; 395 double stars; and 189 variable stars. The Autostar will also locate the centroids of all 88 constellations and 50 objects in the solar system (8 major planets from Mercury to Pluto; the Moon; 26 asteroids; and 15 periodic comets). You can use it to track 50 Earth satellites, including the International Space Station, the Hubble space telescope, and Mir. You can also automatically move to any object that's not in the database simply by entering its right ascension and declination coordinates, perhaps to the comet positions published monthly in Astronomy and Sky & Telescope magazines. You get pushbutton 9-speed dual-axis operation, from a slow 2x the sidereal rate for centering objects to fast 4.5 degrees per second to locate them.

    The hand control gives you a continuous digital readout of the telescope position in r.a. and dec. You can add user-defined objects of your own to its 1471 star and object database. In addition, the Autostar computer readout will display the distance, temperature, mass, size, and historical information about any of the stars and objects in its database. And it will take you on self-guided tours of the best objects visible from your location on any given night, along with over 20 other menu options.

  • Takahashi fluorite lens

    Apochromatic means "free from spurious color" - a refractor system without the faint
    violet halos of out-of-focus light you see around the planets, the limb of the Moon,
    and all the bright stars in an ordinary achromatic (crown and flint glass) refractor.
    All Takahashi fluorite doublet optical tubes are true apochromatic optical systems,
    with virtually perfect color correction.

    Takahashi has been the acknowledged leader in ultra-premium apochromatic fluorite
    optics ever since they produced the first commercial fluorite refractor in 1979.
    That system moved Takahashi to a position of industry leadership in terms of optical
    quality, and Takahashi has never looked back since moving to the head of the class.

    The Takahashi two-element air-spaced objective lenses use a full aperture laboratory-grown
    calcium fluorite crystal lens element, combined with a high refractive index flint-type
    glass element. This yields very high color fidelity and vanishingly low levels of
    spurious color. Laboratory-grown fluorite crystals are used, rather than naturally-occurring
    crystals, due to the lab-grown variety's optical uniformity, clarity, freedom from
    striae and internal stresses, freedom from being adversely affected by dew and moisture
    (as early natural-crystal fluorite lenses could be), and their ability to be hard
    multicoated in a vacuum chamber for high light transmission.

    The Takahashi color correction equals, or exceeds, that of most triplet lens systems
    regardless of cost or brand name. Contrast is generally superior to triplet systems
    or doublet systems that use a low-dispersion crown glass element instead of fluorite
    crystal.

    Since the Takahashi two-element air-spaced designs have fewer light-absorbing lenses
    than triplet systems, they generally have less glass to absorb light, therefore
    yielding brighter images than most triplets. All optics are fully ion-deposited
    hard multicoated (including the fluorite element) for maximum light transmission
    and contrast. Maintenance is less than oil-spaced designs, since there is no oil
    to potentially leak or become cloudy with age. In addition, Takahashi lens cells
    are fully collimatable for peak optical performance by using a simple optional Cheshire-type
    collimating eyepiece and the locking collimating screws on the lens cell.

    The diagram below shows the differences in color correction between a conventional
    BK7 optical glass lens (shown in red), an ED glass lens (in blue), and a lens of
    calcium fluorite crystal (in green). The smaller the departure from the ideal focus,
    shown by the vertical line labeled "0", the lower the amount of chromatic aberration
    and the better the correction for the specific color shown at the left of the diagram.
    You'll note that the green line of the fluorite lens shows much less chromatic aberration
    across the entire visible spectrum than either of the other two glass types.



  • LPI camera

    The LPI (Lunar/Planetary Imager) supplied with this telescope is an electronic eyeball that combines the power of an electronic astronomical imager/autoguider with the simplicity of a web cam. When connected to a laptop or Windows-based PC via the supplied cables, it puts a real time full-color image of the object being observed onto your computer screen. The Lunar/Planetary Imager is designed for high-power imaging of the Moon, planets, and terrestrial targets. It is not suitable for long exposure imaging of faint deep space objects.

    All you need to do to take a close-up picture of the Moon or a planet is insert the LPI in your telescope in place of the eyepiece (the LPI has a magnification and field of view approximately equal to that of a 6mm Plössl eyepiece). Center the object you want to image, focus the camera (using the Magic Eye software-assisted focusing supplied in the included Autostar Software Suite program), and shoot. The Lunar Planetary Imager has software-controlled automatic and manual control of exposure times from 0.001 to 15 seconds (up to 450x longer than conventional web cams). The multi-function imaging program in the supplied Autostar Software Suite software automatically takes multiple exposures and selects the best images. It can align multiple images and combine them into a single sharper and improved image. The LPI can also be used as an autoguider for long exposure deep space photography with a 35mm camera or a CCD camera that does not have a built-in guiding chip. (The LPI cannot take images and guide at the same time).

    The Autostar Software Suite and Lunar Planetary Imager are standard equipment with all Autostar-equipped versions of the LXD-75, all LX90-LNT, and all LX200GPS-SMT scopes. They are also available separately for use with all previous LX90 and LX200GPS scopes equipped with the Autostar II hand control. The package is not available for non-GPS scopes. The Autostar Software Suite and Lunar Planetary Imager can also be used with any Meade telescope using a #497 Autostar hand controller (such as the ETX-90/105/125 Maksutovs and all LXD-55 scopes with Autostar).

  • AutoStar software

    An AutoStar Suite Software CD-ROM is included as standard equipment with each LXD-75, LX90, and LX200 telescope. This software package integrates the telescope with a Windows-based PC or laptop computer for an enhanced range of performance features. It includes a planetarium program with a database of 19,000,000 stars and deep space objects for display on your computer screen. All of the best on-screen display and star chart-printing features of a standard planetarium program are included for stand-alone use when nights are cloudy, or for planning observing sessions.

    The software lets you enable or disable the Hubble Guide Star Catalog; set the on-screen Viewpoint to go to the current zenith or any R.A. and Dec. coordinate; choose any object by catalog name or number; enable or disable custom catalogs; add new catalogs; set magnitude limits; flip the star map for correct orientation as you observe through the telescope; zoom the star map display from 180° down to tiny fractions of an arc second; adjust label fonts and colors, coordinate grid colors, and brightness and contrast; enable or disable the night vision mode; and more.

    In addition, if you connect the scope to your computer, the program lets you click on objects in the sky map that is displayed on the computer screen and have your telescope automatically slew to those objects. You can automatically generate AutoStar Tours of favorite objects with a simple point and click, as well as using the program to keep observing logs.

    The software lets you control all AutoStar functions from your computer or laptop. You can use it to create observing lists and download them to the AutoStar for use in the field when you don't have your computer or laptop with you. "Talking Telescope" software (included) converts AutoStar text displays to synthesized speech through your computer's speaker. An AutoStar Update Tool in the software keeps your AutoStar II computer hand control current by downloading the latest system firmware updates and comet, asteroid, and satellite data from the internet.

    You can also use the software to control your telescope remotely via the internet. Designed to be the ultimate platform for remote digital astronomy with your Meade telescope, the AutoStar Suite Astronomer's Edition contains tools for dome controls, weather sensors, and other functions required for this purpose. You can reach your telescope and dome through a single network connection. You can then communicate via an IP address, using the AutoStar Net Scope program to control the entire observatory over the Internet. This solves the biggest problem in setting up for remote access to your telescope - the problem of your distance from the scope itself. You can be in your living room to control the scope in your backyard, or just as easily, control a friend's system in another country!

    The minimum computer requirements for installing the AutoStar Suite Software are a PC running Windows 98SE or later, with a minimum of 64 MB of RAM, and 200 MB of free hard disk space.

  • LX200 computer

    This Telescope's AutoStar II Computer, Smart Mount, and GPS System . . .

    • GPS/AutoStar computer operation: The operation of an LX200 is simplicity itself. Once you mount the scope on its tripod, you simply turn it on. An integrated true-level electronic sensor levels the optical tube parallel to the ground. A 16-channel GPS (global positioning satellite) receiver in the left fork arm uses a network of earth-orbiting government satellites to first quickly triangulate the scope's position on the earth with an accuracy measured in meters, then determine the time to fraction of a second accuracy. A built-in electronic compass automatically rotates the scope optical tube to aim it due north (the home position). This is a tremendous help if trees or buildings block your view of the north. Built-in software compensates for magnetic declination errors (the difference between true north and magnetic north at your observing location).
          Once the scope reaches the home position (it only takes a minute or two), press the "enter" button on the AutoStar II hand controller to start the astronomical alignment. The LX200 slews at 8° per second to the first of two alignment stars (6° per second in the case of a 16" scope). If that star is not precisely centered, a touch or two on the AutoStar II hand control directional push buttons quickly centers it. Do the same with the second alignment star the scope moves to and you're ready to observe. That's it! For the rest of the evening, a computer in the AutoStar II controls the scope's altitude and azimuth motors to keep you precisely centered on whatever you aim at, for as long as you want to observe.
          It takes only a few moments to begin observing, since you never have to line up on the celestial pole, take the time to precisely level the tripod, input observing latitude and longitude and accurate local time, or adjust imprecise manual setting circles to match the sky.

    • AutoStar II computer: This scope's AutoStar II computer can show you the planets and thousands of deep space objects the very first night you use your scope - even if you've never used a telescope before! The computer's 3.5 megabyte flash memory (which you can upgrade at any time for free via the internet) contains the following objects:
      • the entire NGC (New General Catalog) of 7840 nebulas, galaxies, and star clusters

      • the IC (Index Catalog) of 5386 nebulas, galaxies, and star clusters

      • the Messier Catalog of the 110 best known deep sky objects

      • the Caldwell Catalog of 109 fascinating objects that Messier missed

      • 227 named objects

      • the Herschel Catalog of 400 faint and difficult deep sky objects

      • the Abell Catalog of 2712 galaxy clusters

      • the Arp Catalog of 645 irregular galaxies

      • the Uppsala Galaxy Catalog of 12,940 galaxies

      • a portion of the Russian Morphological Catalog listing 12,939 of its 30,642 galaxies down to magnitude 15

      • the General Catalog of 28,484 variable stars

      • the SAO and Hipparcos Star Catalogs of 31,090 stars

          Also included are the eight major planets out to Pluto, the Moon, asteroids, comets, Earth satellites, and more. You can also add your own selected favorite deep sky objects in a separate catalog. The AutoStar II computer keeps a total database of 147,541 stars and objects in its memory for you to observe.
          Granted, a good number of the faintest objects will not be visible in the smaller aperture telescopes (for example, the 14th through 15th magnitude galaxies of the Russian Morphological Catalog are not eyepiece objects in an 8" scope that has a visual limiting magnitude of 14 under perfect dark sky seeing conditions), but they are all photographable with any of the telescopes given the right equipment and a modicum of persistence.
          Simply call up any of these 147,541 discrete objects on the AutoStar II hand control's two line/sixteen character night-vision red screen by using the 20-button numeric keypad. Then press the "go-to" key. The LX200 slews to that object at a fast 6° to 8° per second (barely 11 seconds to go from horizon to zenith). The telescope quickly centers your chosen object in the field of view for you to enjoy. It routinely centers objects with an accuracy that puts them well within the field of the standard equipment eyepiece (usually within two arc minutes of dead center). The supplied Smart Mount Technology system (see below) can improve that accuracy still further.
          Once the object is located, the hand control screen tells you its catalog number, type, magnitude, size, right ascension, and declination. If you have the coordinates of an object not in the computer's memory (a comet or asteroid, for example), enter those coordinates, press "go-to," and your LX200 takes you there at speeds of up to 8° per second, as well. You can find faint deep space objects almost faster than you can read about it. If you want to scan the skies on your own, the AutoStar II keypad lets you move the scope in any direction at any of nine scanning and centering speeds up to 8 degrees per second.
          The AutoStar II computer includes an RS232 serial port for interfacing with a Windows-equipped computer. This allows remote control of the scope, as well as the ability to upgrade the operating system and database at any time at no cost through Meade's website. The scope hand control provides brightness control of the computer keypad, a real-time digital readout of the telescope position in right ascension and declination, and a variety of other unique keypad/display panel functions.

    • Smart Drive: The LX200 has built-in dual-axis Smart Drive permanent periodic error correction (PPEC) to make deep space photography easier. This computer circuit automatically corrects for the minor drive errors present in every telescope - regardless of size, brand, or cost. It reduces by up to 90% the number of guiding corrections needed to compensate for those errors during long exposure photos. Simply use an optional illuminated reticle eyepiece to guide once on a star for a short time. Use the AutoStar hand control to make the corrections needed to keep the star centered on the eyepiece crosshairs. The Smart Drive remembers those corrections and automatically plays them back whenever the telescope is operating - virtually eliminating repetitive corrections during astrophotography. The dual-axis Smart Drive even corrects for declination errors, not just right ascension errors as with competitive scopes.

    • SMT (Smart Mount Technology): This standard equipment software program provides improved (and constantly improvable) pointing accuracy with the LX200. The already high pointing accuracy of the telescope is further refined with every object that you center precisely and synchronize on during a night's observing. The program works in both altazimuth and equatorial modes. It includes a simple routine to refine the pointing accuracy for the entire sky with your particular equipment configuration and alignment. The refined pointing data can be saved and reused for permanent and portable setups.

    • Home Pulse Acquisition on 16" Models: Included as standard equipment with all 16" LX200 models, and unique among commercial telescopes, is a special "home pulse" feature that allows the telescope's operating system to maintain the telescope's pointing position in non-volatile memory, even when the telescope is turned off. This allows the telescope to be remotely aligned and operated over a long distance (even thousands of miles), by using a modem link to the telescope's RS-232 serial interface. In this way Meade 16" LX200 telescopes may be operated through a pre-programmed sequence of, for example, CCD imaging, without a human operator being present in the observatory.
  • LX200 mount

    The mount's drive base is made of heavy-duty die-cast aluminum, as are the dual fork arms that support the optical tube. The fork arms are shaped to damp vibrations quickly. There is a carrying handle on each fork arm. An adjustable bracket to hold the Autostar computer hand control can be attached to either carry handle, for convenient hands-free viewing of the computer display and operation by either a right-handed or left-handed observer. Both manual and electric slow motion controls are provided in both right ascension and declination. Analog setting circles are provided on the mount (5" in declination and 8.75" in right ascension), in addition to the digital r.a. and dec readouts on the Autostar computer hand control. The drive base has a 7-port multi-function control panel, including two RS-232 serial interface ports for communication with an external computer and other ancillary equipment.

    The mount includes servo-controlled 12VDC slewing and tracking motors with 5.75" worm gear drives in both altitude and azimuth. The declination axis is supported by three 1.83" diameter ball bearings. Two ball bearings (one 4" and one 2.25") provide smooth motion in right ascension. The drive system has 185 individually selectable drive speeds in both right ascension and declination to permit observatory-level precision in tracking, guiding, and slewing. You can choose from 0.01x to 1.0x sidereal, variable in 0.01x increments; 2x, 8x, 16x, 64x, or 128x the sidereal rate; as well as 1°/sec. to 8°/sec., variable in 0.1° increments. You can select either a sidereal or lunar tracking rate, or you can custom-select a drive speed from 2000 incremental rates to match solar or planetary motions.

    The scope is powered by eight user-supplied C-cell batteries that fit into the fork arms. You don't need an external battery pack or AC power supply as you do with competitive GPS scopes. Battery life is typically about 20 hours in warm weather, decreasing as the amount of slewing increases or as the temperature drops. Optional adapters (with 25' cords) are available to allow you to power the scope from 110-120 volt 60 Hz AC household current in your back yard to conserve battery life, or to power the scope from your car's cigarette lighter plug or a rechargeable battery for extended use in the field.

  • LX200GPS standard optics

    Features of this Telescope's Optical System . . .

    • Oversized primary mirror: The diameter of the primary mirror of each LX200GPS is larger than the diameter of the Schmidt corrector lens at the front of its optical tube that admits the light. The primary mirror of the 8" scope is actually 8.25" in diameter, compared to the 8" diameter of the corrector lens. The 10" primary is 10.375" in diameter; the 12" is 12.375"; the 14" is 14.57"; and the 16" primary is 16.375" in diameter. Oversizing the primary mirror in this way gives you a wider fully-illuminated field than a conventional SCT whose corrector and primary mirror are the same size. The result is a gain of 5% to 8% more off-axis light available to your eye or camera, depending on the telescope.

    • Fully coated optics: The Pyrex primary and secondary mirrors are vacuum-coated with a thin layer of aluminum that provides approximately 89% reflectivity per surface. Once aluminized, the mirrors are overcoated with a protective layer of silicon monoxide (quartz) for long life.
          A thin layer of anti-reflection magnesium fluoride is vacuum deposited on both sides of the clear float glass Schmidt corrector plate (BK7 optical glass in the case of the 16" scopes for increased IR and UV transmission for scientific measurements) to provide a high 98.7% light transmission per surface, compared to the 96% transmission of uncoated glass. Overall light throughput (the amount of light collected by the objective lens that actually reaches your eye or camera) is approximately 77% at the Cassegrain focus.
          For those interested in even more brightness for photography and observing faint deep space objects, Meade also offers this scope with optional UHTC (Ultra High Transmission Coatings) for a 15% increase in light throughput. Optional UHTC multicoatings effectively add the equivalent of extra light-gathering aperture to the performance of a scope with standard coatings (the equivalent of three-quarters of an inch of extra aperture in the case of a 10" scope, for example), but with no increase in actual size or weight.

    • Fully baffled optics: A cylindrical baffle around the secondary mirror, in combination with the cylindrical baffle tube projecting from the primary mirror, prevents stray off-axis light from reaching the image plane. In addition, a series of field stops machined into the inner surface of the central baffle tube effectively eliminates undesirable light which might reflect from the inside surface of the baffle tube. The result of these baffle systems is improved contrast in lunar, planetary, and deep space observing alike.

    • Mirror lock: A progressive tension lock knob on the rear cell locks the telescope's primary mirror rigidly in place once an approximate manual focus has been achieved. The standard equipment electric focuser, described below, is then used for fine focusing. Locking the mirror eliminates the possibility of mirror shift (the image moving from side to side while focusing, caused by the primary mirror tilting on the central baffle tube as the mirror moves fore and aft along the tube). Mirror shift, once the bane of CCD astrophotographers because it could easily move the image off a small CCD chip, is non-existent with the Meade system.

    • Electric focuser: The supplied zero image-shift electric microfocuser is controlled by the scope's Autostar II computer hand control. It moves an externally-mounted eyepiece or camera to focus, rather than moving the primary mirror. This eliminates mirror shift during precise image centering and focusing for CCD applications or very high magnification visual observing. The microfocuser has four different operating speeds, from very fast down to an extremely slow creep, giving you focusing accuracy to a truly microscopic level during critical visual and astrophotographic applications.
          The focuser is designed to hold 2" star diagonals and eyepieces. A supplied 1.25" adapter allows the use of 1.25" diagonals and eyepieces in the 2" focuser. Another supplied adapter duplicates the 2" rear cell thread used on Schmidt-Cassegrain telescopes to allow the use of off-axis guiders, T-adapters, etc. A 1.25" visual back is not supplied with the scope. If you want to do high magnification eyepiece projection photography of the Moon and planets, you will have to add an optional 1.25" visual back #9135 and a tele-extender to the focuser's supplied 2" rear cell thread adapter.
  • LX200GPS UHTC optics

    Features of this Telescope's Optical System . . .

    • Oversized primary mirror: The diameter of the primary mirror of each LX200GPS is larger than the diameter of the Schmidt corrector lens at the front of its optical tube that admits the light. The primary mirror of the 8" scope is actually 8.25" in diameter, compared to the 8" diameter of the corrector lens. The 10" primary is 10.375" in diameter; the 12" is 12.375"; the 14" is 14.57"; and the 16" primary is 16.375" in diameter. Oversizing the primary mirror in this way gives you a wider fully-illuminated field than a conventional SCT whose corrector and primary mirror are the same size. The result is a gain of 5% to 8% more off-axis light available to your eye or camera, depending on the telescope.

    • Fully multicoated UHTC (Ultra High Transmission Coatings) optics: The primary and secondary mirrors are vacuum-coated with aluminum, enhanced with multiple layers of titanium dioxide and silicon dioxide for increased reflectivity. These multicoatings are then overcoated with a protective layer of silicon monoxide (quartz) for long life.
          A series of anti-reflective coatings of aluminum oxide, titanium dioxide, and magnesium fluoride are vacuum-deposited on both sides of the clear float glass Schmidt corrector plate (BK7 optical glass in the case of the 16" scopes for increased IR and UV transmission for scientific measurements). These antireflection multicoatings provide a high 99.8% light transmission per surface, versus a per-surface transmission of 98.7% for standard single-layer coatings. Overall light throughput (the amount of light collected by the objective lens that actually reaches your eye or camera) is approximately 89% at the Cassegrain focus.
          UHTC multicoatings provide a 15% increase in light throughput (the amount of light collected by the objective lens that actually reaches your eye or camera), when compared with standard coatings. They effectively add the equivalent of extra light-gathering aperture to the performance of a scope with standard coatings (the equivalent of three-quarters of an inch of extra aperture in the case of a 10" scope, for example), but with no increase in actual size or weight. They also improve contrast, for lunar and planetary images that appear sharper and more crisply defined.

    • Fully baffled optics: A cylindrical baffle around the secondary mirror, in combination with the cylindrical baffle tube projecting from the primary mirror, prevents stray off-axis light from reaching the image plane. In addition, a series of field stops machined into the inner surface of the central baffle tube effectively eliminates undesirable light which might reflect from the inside surface of the baffle tube. The result of these baffle systems is improved contrast in lunar, planetary, and deep space observing alike.

    • Mirror lock: A progressive tension lock knob on the rear cell locks the telescope's primary mirror rigidly in place once an approximate manual focus has been achieved. The standard equipment electric focuser, described below, is then used for fine focusing. Locking the mirror eliminates the possibility of mirror shift (the image moving from side to side while focusing, caused by the primary mirror tilting on the central baffle tube as the mirror moves fore and aft along the baffle tube). Mirror shift, once the bane of CCD astrophotographers because it could easily move the image off a small CCD chip, is non-existent with the Meade system.

    • Electric focuser: The supplied zero image-shift electric microfocuser is controlled by the Autostar II computer hand control. It moves an externally-mounted eyepiece or camera to focus, rather than moving the primary mirror. This eliminates mirror shift during precise image centering and focusing for CCD applications and very high magnification visual observing. The microfocuser has four different operating speeds, from very fast down to an extremely slow creep, giving you focusing accuracy to a truly microscopic level during critical visual and astrophotographic applications.
          The focuser is designed to hold 2" star diagonals and eyepieces. A supplied 1.25" adapter allows the use of 1.25" diagonals and eyepieces in the 2" focuser. Another supplied adapter duplicates the 2" rear cell thread used on Schmidt-Cassegrain telescopes to allow the use of off-axis guiders, T-adapters, etc. A 1.25" visual back is not supplied with the scope. If you want to do high magnification eyepiece projection photography of the Moon and planets, you will have to add an optional 1.25" visual back #9135 and a tele-extender to the focuser's supplied 2" rear cell thread adapter.
  • SLT computer

    NexStar Computer Hand Control: The supplied NexStar computer hand control
    has an illuminated numeric keypad and a two-line 16-character LCD display. It stores
    in a holder that clips to one of the tripod legs. The telescope can be operated
    with the ergonomically-designed hand control conveniently docked in its holder.
    You can also remove the control and its coiled connecting cord from the holder for
    hand-held use. There is no need to worry about wrapping the cord around the mount
    as you walk around the scope to observe different parts of the sky. The hand control
    plugs into the fork arm rather than the drive base, so it always moves with the
    scope.

        The NexStar computer has a database of 4,033 stars and objects that
    it can locate and track for you. The database includes the complete Messier and
    Caldwell catalogs of famous deep space objects; a selection of the brightest and
    best deep space objects from the Revised New General Catalog (NGC); selected SAO
    stars, including the best variable stars and multiple star systems; the planets;
    the Moon; and more. You can also store and edit the right ascension and declination
    coordinates of 25 objects of your own choosing, such as favorite deep space objects
    or the comet and asteroid coordinates published monthly in Astronomy and
    Sky & Telescope magazines.

        With the NexStar's hand control, you can select an object catalog
    at the touch of a button; automatically slew to any of the 4,033 objects in its
    memory, including over 600 galaxies, 300 star clusters, and dozens of beautiful
    binary stars; change the slew speed; view fascinating information about an object,
    including enhanced information on more than 100 particularly fascinating objects;
    or simply determine if a desired object is visible in the sky. The computer's hand
    control/database software and motor drive software can be flash upgraded via the
    internet so you will always have the most up-to-date software version available.

    SkyAlign Technology: With new patent-pending Celestron SkyAlign
    technology, you don't have to know Altair from Zubenelgenubi or know how to
    read a star chart to line up your telescope on the sky. There is also no need to
    point the telescope north and level the optical tube or to pay extra for a competitive
    scope that levels the scope and points it north for you. With SkyAlign, the
    initial position of the telescope is irrelevant. Trees and buildings can block your
    view of the north celestial pole and you'll still be able to properly align the
    scope on the sky. This makes for fast and very easy alignment of the telescope every
    time you take it out to observe.

        Simply input the date, time, and your location into the computer hand
    control. The NexStar computer has a U.S. and international city database that lets
    you easily set your observing location. It will normally default to your last observing
    site automatically, but can remember up to ten different favorite observing locations
    for you to choose from. There is also an auxiliary port in the fork arm in the unlikely
    event you would want to connect an optional Celestron CN-16 GPS (Global Positioning
    Satellite) module to input the time, date, and observing location automatically
    by using signals broadcast from space by a network of orbiting government satellites.
    The SkyAlign system is so quick and easy to use that the added expense of
    a GPS system is realistically unnecessary.

        Once you've entered the date, time, and location, use the Star Pointer
    red dot LED finder to align the telescope on any three bright stars, or to two stars
    and a bright planet or even the Moon. You don't need to know the names of the stars
    or the planet. The NexStar computer system will automatically determine which objects
    were chosen and then generate an internal map of the sky that will let it move automatically
    to any star or object you select for the rest of the night. It does it by calculating
    the angles and distances measured between the objects you've chosen and then compares
    them to the known separations between objects. Using this method, the telescope
    determines what objects were chosen. The display will tell you which three objects
    you aligned to for confirmation.

        Only two of the alignment objects will actually be used for calculating
    the model of the sky that the computer uses for locating objects. The third object
    simply provides a positive identification of the other two. Therefore, at least
    two of the three alignment objects should be spaced at least 60 degrees apart in
    the sky if possible, and the third object should not fall in a straight line between
    the first two alignment stars.

        Since the brightest stars appear first as the sky darkens at dusk,
    the SkyAlign system is exceptionally easy to set up and use as night comes
    on. You don't have to guess which stars are brightest, as only the brightest will
    be visible in the early evening. The same holds true for observers from a light-polluted
    suburban site, where only the brightest stars are visible to the unaided eye.

        Once the scope has aligned itself with the sky, it takes only a few
    keystrokes on the computer hand control to have the scope move automatically to
    your night's first observing target and start tracking it so you can observe at
    your leisure. You can find hundreds of fascinating deep space objects your first
    night out, even if you have never used a telescope before. No matter what level
    of experience you start from, your NexStar SLT scope will unfold all the wonders
    of the Universe for you, your family, and your friends.

        You can click on the link below to download a brief RealPlayer movie
    showing how quick and easy it is to line up your scope on the sky with SkyAlign.
    There is also a link to download RealPlayer for free if your PC does not already
    have the program.



  • SLT mount

    The SLT mount's single fork arm is made of die cast aluminum. It is rigid and damps vibrations quickly. The optical tube mounts onto the fork arm using a no-tool quick-release dovetail bracket for fast set-up and take-down. This allows you to use the mount with other lightweight optical tubes that have the appropriate dovetail. The offset fork arm places the center of mass of the fork arm/optical tube over the axis of rotation of the mount. This keeps the optical tube properly balanced in all planes, no matter where in the sky it is aimed. Built-in friction clutches in altitude and azimuth keep the optical tube firmly centered on the object you are watching when you change eyepieces. No mechanical locking levers are required.
        The mount includes pre-installed dual DC servo motor drives - one for moving the scope in altitude (up/down) and one for azimuth (right/left). The combined motion of the two motors allows the scope to move smoothly in an arc across the sky, following the seemingly curved path taken by the stars and planets. Built-in electronics let you select the appropriate lunar, solar, or sidereal (star) tracking rate to keep each specific kind of object centered in the field of view so that several people can observe at their leisure without having constantly to adjust the position of the scope. The electronics also give you a choice of nine different slewing and centering speeds for locating objects (4°/sec, 2°/sec, 1°/sec, 0.5°/sec, and 32x/16x/8x/4x/2x the sidereal rates).
        A compartment in the drive base holds eight user-supplied AA batteries for powering the telescope. All power connections to the motors are internal. This eliminates the cord wrap problems you often find with competitive telescopes powered by an external battery pack that connects to the scope through a dangling power cord.
        To conserve battery life when the telescope is being used in the backyard, an optional AC adapter (#2338) is available to operate the scope from an extension cord connected to a normal household 110 VAC electric outlet. The Celestron Power Tank (#4512V) is also a highly recommended optional accessory if you observe away from home a lot. This is a 7 amp-hour capacity multi-purpose rechargeable 12V DC battery that can provide several nights worth of observing from a single charge when you're in the field away from backyard AC.
        The underside of the mount's drive base is cone-shaped. It slips into a cone-shaped receptacle on the top of the tripod and is held in place by one large hand-tighten knob in the tripod. Assembly is fast and foolproof. There is no need to fumble with multiple mounting bolts, or try to align mounting bolts in a tripod with holes you can't see in the base of the mount, as is the case with competitive scopes. The SLT mount's no-tool assembly is foolproof and takes only a few seconds.
        The preassembled adjustable-height tripod has stainless steel legs to damp vibrations quickly. The center leg brace holds a convenient no-tool quick-release accessory tray to keep your eyepieces and accessories up and out of the dew-soaked grass. The locking knobs for the tripod leg height adjustment face inwards, so they won't snag your clothing as you move around the tripod in the dark.

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