LX200-ACF 16" Advanced Coma-Free Go-to altazimuth

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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.
16" LX200 mount
The mount’s drive base and dual fork arm assembly is made of heavy-duty die-cast aluminum. For added strength and rigidity the base and forks are cast in one continuous U-shaped piece, rather than being a less-rigid three-piece assembly of two vertical arms bolted to the sides of the drive base. The optical tube has two factory-installed declination housings which bolt to the tops of the one-piece U-shaped fork to complete the very rigid optical assembly.

There are two carrying handles on each declination housing for lifting the tube. At least two people are needed to lift the 125 pound optical tube up onto the fork arms and bolt it into place. Analog setting circles are provided on the mount (12” in declination and 17” in right ascension, both with verniers), 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 18VDC high torque slewing and tracking motors with 11” worm gear drives in both altitude and azimuth. The declination axis is supported by four 80mm roller bearings (two per side). Two additional roller bearings, one 100mm and one 150mm, provide smooth motion in right ascension.

The drive system has over 2000 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 6°/sec., variable in 0.1° increments. You can also select either a pre-set sidereal or lunar tracking rate, or you can custom-select a drive speed from 2000 incremental rates to match solar or planetary motions.

There is a supplied adapter with a 25' cord that lets you power the scope from 110-120 volt 60 Hz AC household current in your back yard or observatory. An optional #1812A adapter lets you power the 18VDC scope from your car's 12VDC cigarette lighter plug or a rechargeable 12 volt battery for extended use in the field. Maximum power draw is 2 amps, so choose a battery with a sufficiently high power capacity to last for a full night’s observing.

LX200-ACF UHTC optics
Features of this Telescope’s Optical System . . .
  • Advanced Coma-Free catadioptric designed to emulate the optical performance of a Ritchey-Chrétien telescope: The traditional two-mirror Ritchey-Chrétien (RC) design uses approximately hyperbolic primary and secondary mirrors to produce images that are free from coma over a wide field. Because of this wide coma-free field and a relatively fast focal ratio, the Ritchey-Chrétien design is particularly well suited to astrophotography. The RC is the design of choice for most of the major professional observatory telescopes built in the last half-century. For example, the Hubble Space Telescope and the twin 10-meter Keck telescopes in Hawaii are Ritchey-Chrétiens.
        However, because of the complexity of fabricating and testing a large aperture hyperbolic mirror (just ask the people who built the initially-flawed, but not discovered until it was in space, Hubble Space Telescope), traditional two-mirror Ritchey-Chrétiens are very expensive to manufacture and purchase, too expensive for many amateur astronomers.
        To emulate the coma-free performance of a true RC telescope, while keeping the cost within reason, the LX200-ACF Advanced Coma-Free (ACF) catadioptric optical system uses a full aperture aspheric corrector lens in conjunction with a simple spherical primary mirror. This creates a two-element primary mirror system that performs like an RC’s single hyperbolic primary mirror from the optical point of view of the LX200-ACF secondary mirror. The hyperbolic secondary mirror itself is mounted directly on the rear of the corrector lens, rather than in the traditional RC’s conventional spider vane assembly. This eliminates the image-degrading diffraction spikes of the secondary mirror support structure visible in commercial RC scope images. The result is RC-class coma-free wide-field performance in the LX200-ACF, at about a fourth the cost of most true RC systems.
        The corrector-modified design would itself be expensive to fabricate were it not for Meade’s more than a quarter-century of experience making Schmidt-Cassegrain correctors, which are in the same optical family as the corrector needed for the coma-free design of the LX200-ACF. An additional benefit of the full aperture corrector in the ACF design is slightly better correction for astigmatism than the traditional RC design.
        In addition, the LX200-ACF, due to its front corrector plate, is a closed tube design. This keeps the primary optical components protected from dust, moisture and other contaminants that might fall on the optical surfaces of the primary and secondary mirrors as can happen with the traditional open-tube RC design.
        While the LX200-ACF may not be a traditional RC design, its performance is RC-like in all important characteristics. A review in Sky & Telescope magazine of the predecessor of the Meade ACF optics said the bottom line is that the optics do “indeed perform like a Ritchey-Chrétien.” Another such review, in Astronomy magazine said, “This scope delivers Ritchey-Chrétien-like performance at a fraction of the cost.”

  • Oversized primary mirror: The diameter of the primary mirror of each LX200-ACF is larger than the diameter of the 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 catadioptric scope 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 model.

  • 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. A overcoating layer of durable silicon monoxide (quartz) assures long life.
        A series of anti-reflective coatings of aluminum oxide, titanium dioxide, and magnesium fluoride are vacuum-deposited on both sides of the full aperture corrector plate. 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 focal plane.
        UHTC multicoatings provide a 15% increase in light throughput compared with standard single-layer coatings. They effectively add the equivalent of 15% extra light-gathering area to the performance of a scope with standard coatings. It’s 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. UHTC coatings 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 center of 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 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 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. 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.
The Meade 16” LX200-ACF (Advanced Coma-Free) catadioptric telescope with UHTC multicoatings provides the serious amateur astronomer and school or college observatory with an economical altazimuth-mount alternative to a very costly Ritchey-Chrétien scope for imaging and visual observing . This Meade’s coma-free flat field optical performance rivals that of professional Ritchey-Chrétien reflector designs. The 16” LX200-ACF includes everything you need to observe – an optical tube with flat-field/coma-free optics and the highest possible light transmission state-of-the-art optical coatings, a go-to motorized fork mount, permanent altazimuth pier, star diagonal, and even an eyepiece. You get it all at a very attractive price when compared with the $30,000+ price tag of commercially-available Ritchey-Chrétien optical tubes only.
If you have an observatory under dark skies that can take full advantage of its immense light gathering capacity (four times that of an 8” scope), this is a scope that can keep you happily observing and photographing the heavens for the rest of your life.

This Telescope’s Optical System . . .
  • Advanced Coma-Free catadioptric designed to emulate the optical performance of a Ritchey-Chrétien telescope: 16” aperture catadioptric (4064mm focal length f/10). Fully multicoated UHTC (Ultra High Transmission Coatings) optics with oversized primary mirror for brighter field edge illumination. Aluminum tube construction with glare-stop baffling and mirror lock. Integral cooling fan on rear cell. 2” electric focuser with 1.25” eyepiece adapter. Guaranteed diffraction-limited performance with a flatter field edge-to-edge than other commercially-available catadioptric optical systems. For more details, click on the “optics” icon above.

  • Finderscope: 8 x 50mm straight-through achromatic design, with a 5° field of view and 14mm eye relief.

  • Star diagonal: 2” UHTC multicoated mirror with 1.25” eyepiece adapter.

  • Eyepiece: 1.25” 26mm Series 5000 5-element Plössl (156x). The eyepiece field of view is 0.38°, over 75% the diameter of the full Moon, for detailed lunar, planetary, and deep space views.

This Telescope’s Mount . . .

  • Fork mount/drive system: One-piece drive base and dual fork arm assembly of die-cast aluminum. The mount includes servo-controlled 18 volt DC high torque slewing and tracking motors in both altitude and azimuth. The motors drive 11” worm gears in both axes. A supplied adapter (with a 25’ cord) powers the 18 VDC scope from 110-120 volt 60 Hz AC household current in your back yard or observatory. For more details, click on the “mount” icon above.

  • GPS/AutoStar II computer: A 16-channel GPS (global positioning satellite) receiver is built into the top of the telescope’s left fork arm. The GPS receiver, in conjunction with a built-in electronic compass and AutoStar computer control, automatically aligns the scope on the sky so that the AutoStar computer can locate for you the 147,541 stars and objects in its memory.
    The AutoStar computer quickly and automatically moves the scope to any desired object (with an accuracy typically in the two arc minute range) and flawlessly tracks the object while you observe at your leisure. In addition, the AutoStar computer provides numerous visual, tracking, and photographic tools and functions to make your observing easier and more enjoyable.
    Unique “Smart Mount” technology can constantly improve the already high pointing accuracy of the telescope with every object that you center precisely and synchronize on during a night’s observing. For more details on these features, click on the “computer” icon above.

  • Permanent altazimuth pier: The scope is designed for permanent altazimuth installation in a two meter (seven foot) or larger observatory dome. The supplied altazimuth pier is 32” tall and 10” in diameter. This puts the eyepiece at an approximate height of 5’ 6” when the scope is pointed about 15° above the horizon. The pier is made of painted steel and weighs 225 pounds.
    The base of the pier is a 0.50” thick circular steel plate that’s 24” in diameter. Three 0.75” wide by 5° long slots on a 20” diameter circle are spaced 120° apart around the base to let you bolt the pier to your observatory pad.

  • AutoStar Suite Astronomer Software: This standard equipment CD-ROM software package is designed to integrate the telescope with your Windows-based PC or laptop computer for an enhanced range of performance features. The AutoStar Suite Software includes a planetarium program with a database of 19,000,000 stars and deep space objects for display on your computer screen. It includes all the standard planetarium program features for stand-alone use when nights are cloudy. In addition, it contains programs for controlling the telescope from your laptop or PC. For more details on the many capabilities and features of the AutoStar Suite Software, click on the “software” icon above.

What can you see through a 16” LX200-ACF with Advanced Coma-Free UHTC optics?

    With a flat coma-free field, state-of-the-art UHTC multicoated optics, and a resolving power of 0.29 arc seconds, this 16” Meade is an advanced instrument capable of serious research and astrophotography for advanced amateur and university alike. With four times the light gathering capacity of an 8” scope (over two and a half times that of a 10” scope), this scope’s fully multicoated 16” optics give the Universe a detail and extent at dark sky sites that no smaller scope can approach – no matter how good that smaller scope might be. Visual observing is an extraordinarily rewarding experience.
The advantages of the scope’s coma-free field, fully multicoated optics, and large diffraction-limited aperture are immediately apparent, particularly to the experienced observer with an eye trained to see extremely fine detail. Color becomes visible to the eye in many nebulas. Orion is a glowing blue-green mass of filaments, often tinged with red and yellow for the keen-eyed observer from a dark sky site. Globular clusters can be resolved to their cores, with each cluster becoming a vivid ball of tiny starpoints instead of a hazy blur. Knottings and structure in the arms of the Whirlpool Galaxy become clear. Small details in the atmospheres of Jupiter and Saturn and on the surface of Mars reveal themselves at high powers (given suitably good seeing and a filter to cut down the immense brightness of a scope with over 3300 times the light-gathering capacity your eye).
The more obscure Messier and NGC objects (such as planetary nebula NGC 3242 in Hydra, spiral galaxy M100 in Coma Berenices, and open cluster NGC 6231 in Scorpius) show detail invisible in smaller scopes. Difficult low surface brightness objects like the Crab Nebula (M1) in Taurus, the face-on Spiral Galaxy (M33) in Triangulum, and the Owl Nebula (M97) in Ursa Major begin to show their essential structures under high-power visual observation. The stars in open clusters remain crisp and point-like to the edge of the field, thanks to the Advanced Coma-Free flat-field performance that is similar to that of professional Ritchey-Chrétien optics, but at only a fraction the price.
These same objects yield magnificently detailed long-exposure CCD and 35mm images. However, field rotation will cause stars at the corners of an image to streak during exposures longer than five minutes with the scope mounted on its permanent altazimuth pier. So, if you plan on doing serious extended deep space photography, you’ll need to add an optional #1222 field derotator to eliminate the field rotation and provide world-class long exposure astrophotos.
This scope needs a permanent observatory home under truly dark and steady skies if you want to take full advantage of its large aperture and superb optical performance. It’s not a scope that’s happy in a light-polluted suburban observing environment.
But, if you have dark skies and a permanent observatory dome, the UHTC-multicoated 16” LX200-ACF on an altazimuth pier may be the ultimate scope for you. It has enough aperture to keep you busy observing and imaging for the rest of your life, with state-of-the art Advanced Coma-Free optics that emulate the performance of professional Ritchey-Chrétien reflectors at a fraction the price. It has equally state-of-the-art UHTC multicoatings and enough useful features to handle almost any observing or astrophotography chore you set for it. And, fully complete with fork arms, drive base, permanent altazimuth pier, and many advanced features, it does it at a price guaranteed to surprise you when compared to the over $30,000 price of a competitive 16” Ritchey-Chrétien bare bones optical tube only that comes without any sort of mount whatsoever at that price.
Highest Useful Magnification:
This is the highest visual power a telescope can achieve before the image becomes too dim for useful observing (generally at about 50x to 60x per inch of telescope aperture). However, this power is very often unreachable due to turbulence in our atmosphere that makes the image too blurry and unstable to see any detail.

On nights of less-than-perfect seeing, medium to low power planetary, binary star, and globular cluster observing (at 25x to 30x per inch of aperture or less) is usually more enjoyable than fruitlessly attempting to push a telescope's magnification to its theoretical limits. Very high powers are generally best reserved for planetary observations and binary star splitting.

Small aperture telescopes can usually use more power per inch of aperture on any given night than larger telescopes, as they look through a smaller column of air and see less of the turbulence in our atmosphere. While some observers use up to 100x per inch of refractor aperture on Mars and Jupiter, the actual number of minutes they spend observing at such powers is small in relation to the number of hours they spend waiting for the atmosphere to stabilize enough for them to use such very high powers.
813x
Visual Limiting Magnitude:
This is the magnitude (or brightness) of the faintest star that can be seen with a telescope. The larger the number, the fainter the star that can be seen. An approximate formula for determining the visual limiting magnitude of a telescope is 7.5 + 5 log aperture (in cm).

This is the formula that we use with all of the telescopes we carry, so that our published specs will be consistent from aperture to aperture, from manufacturer to manufacturer. Some telescope makers may use other unspecified methods to determine the limiting magnitude, so their published figures may differ from ours.

Keep in mind that this formula does not take into account light loss within the scope, seeing conditions, the observer’s age (visual performance decreases as we get older), the telescope’s age (the reflectivity of telescope mirrors decreases as they get older), etc. The limiting magnitudes specified by manufacturers for their telescopes assume very dark skies, trained observers, and excellent atmospheric transparency – and are therefore rarely obtainable under average observing conditions. The photographic limiting magnitude is always greater than the visual (typically by two magnitudes).

15.5
Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

4064mm
Focal Ratio:
This is the ‘speed’ of a telescope’s optics, found by dividing the focal length by the aperture. The smaller the f/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.

An f/5 system can photograph a nebula or other faint extended deep space object in one-fourth the time of an f/10 system, but the image will be only one-half as large. Point sources, such as stars, are recorded based on the aperture, however, rather than the focal ratio – so that the larger the aperture, the fainter the star you can see or photograph, no matter what the focal ratio.

f/10
Resolution:
This is the ability of a telescope to separate closely-spaced binary stars into two distinct objects, measured in seconds of arc. One arc second equals 1/3600th of a degree and is about the width of a 25-cent coin at a distance of three miles! In essence, resolution is a measure of how much detail a telescope can reveal. The resolution values on our website are derived using the Dawes’ limit formula.

Dawes’ limit only applies to point sources of light (stars). Smaller separations can be resolved in extended objects, such as the planets. For example, Cassini’s Division in the rings of Saturn (0.5 arc seconds across), was discovered using a 2.5” telescope – which has a Dawes’ limit of 1.8 arc seconds!

The ability of a telescope to resolve to Dawes’ limit is usually much more affected by seeing conditions, by the difference in brightness between the binary star components, and by the observer’s visual acuity, than it is by the optical quality of the telescope.

0.29 arc seconds
Aperture:
This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
16"
Weight:
The weight of this product.
455 lbs.
Heaviest Single Component:
The weight of the heaviest component in this package.
225 lbs.
Telescope Type:
The optical design of a telescope.  Telescope type is classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, or by the task they perform.
Advanced Coma-Free
 
Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .
Terrestrial Observation:
Observing terrestrial objects (nature studies, birding, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial observing. Scopes with apertures under 5" to 6" are generally most useful for terrestrial observing due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes. 
No
Lunar Observation:
Visual observation of the Moon is possible with any telescope. Larger aperture scopes will provide more detail than smaller scopes, thereby getting a higher score in this category, but may require an eyepiece filter to cut down the greater glare from the Moon's sunlit surface so small details can be seen more easily. Lunar observing is more rewarding when the Moon is waxing or waning as the changing sun angle casts constantly varying shadows to reveal craters and surface features by the hundreds.  
Very Good
Planetary Observation:
Very Good
Binary and Star Cluster Observation:
Very Good
Galaxy and Nebula Observation:
Very Good
Photography:
Yes
Terrestrial Photography:
Photographing terrestrial objects (wildlife, scenery, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial photography. Scopes with focal ratios of f/10 and faster and apertures under 5" to 6" are generally the most useful for terrestrial photography due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.
No
Lunar Photography:
Photography of the Moon is possible with virtually any telescope, using a 35mm camera, DSLR, or CCD-based webcam (planetary imager). While an equatorial mount with a motor drive is not strictly essential, as the exposure times will be very short, such a mount would be helpful to improve image sharpness, particularly with webcam-type cameras that take a series of exposures over time and stack them together. Reflectors may require a Barlow lens to let the camera reach focus. 
Yes
Planetary Photography:
Yes
Star Cluster / Nebula / Galaxy Photography:
Yes
Warranty:
1 year
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General Accessories
Dewcaps and Lens Shades (1)
#620 For Meade 16" SCT, white finish aluminum
by Meade
Quantity:  
$349.00 
Extended Service Program (2)
Three-Year Sky Assurance™ for Meade telescopes priced between $11,000 and $12,999.99
by Meade
Quantity:  
$899.99 
Five-Year Sky Assurance™ For Meade telescopes priced between $11,000 and $12,999.99
by Meade
Quantity:  
$1,344.99 
Visual Accessories
Eyepieces (1)
56mm Series 4000 Super Plössl
by Meade
Quantity:  
$79.99 
Filters (2)
Filter Set #1 – #12, 23A, 58, and 80A
by Meade
Quantity:  
$49.95 
#ND96 Neutral density grey 1.25" Series 4000 Moon filter
by Meade
Quantity:  
$16.95 
Flashlights, Night Vision (1)
Skylite Water-resistant variable brightness two-color LED astronomer's flashlight
by Rigel Systems
Quantity:  
$34.95 
  • 16” f/10 Advanced Coma-Free catadioptric optics with UHTC group multicoatings (multicoated enhanced aluminum coated Pyrex mirrors overcoated with quartz and multicoated water white glass corrector lens), integral glare stops in the baffle tube, primary mirror lock, integral cooling fan, and 4-speed zero image shift microfocuser
  • Heavy duty fork mount with carrying/tube positioning handles, electric slow motion controls and locks on both axes
  • 16-channel GPS (global positioning system) automatic alignment system, with electronic true-level sensor and automatic magnetic declination correction
  • AutoStar II go-to computer control system with Smart Mount Technology, 3.5 Megabyte flash memory, multifunction keypad hand control with 2-line digital readout display, permanently programmable Smart Drive dual-axis periodic error correction, 195-speed drive controls on both axes (with slewing at up to 6 degrees per second), High-Precision Pointing, onboard celestial software library with 147,541 objects
  • Adjustable tilt hand control holder on drive base
  • 7-port multi-function control panel on drive base, including two RS-232 serial interface ports
  • Computer-controlled high-torque 18 volt DC right ascension and declination worm gear drives with 11” main drive gears
  • 25’ power cord for operation from 110-120 volt 60 Hz household AC power (optional adapter is available for powering from an automobile cigarette lighter plug or rechargeable 12 volt battery)
  • Straight-through 8 x 50mm finder on removable dovetail
  • Zero image shift electric focuser with adapters that emulate a 2” SCT rear cell, 2” focuser drawtube, and 1.25” focuser drawtube only (no 1.25” visual back for eyepiece projection photography)
  • 2” mirror star diagonal with UHTC coatings and 1.25” eyepiece adapter
  • 1.25” 26mm Series 5000 Plössl eyepiece (156x)
  • Steel permanent altazimuth pier
  • Dust cover
  • AutoStar Software Suite Astronomer’s Edition.
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Meade - LX200-ACF 16" Advanced Coma-Free Go-to altazimuth

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Meade - LX200-ACF 16" Advanced Coma-Free Go-to altazimuthClose-up of the optical tube showing the finderscope, extra-large declination setting circle, GPS antenna, and electric focuser.Close-up image of the scope's drive base, control panel, and hand control.
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Our Product #: 16210RAU
Manufacturer Product #: 1610-60-02AZ
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The Meade 16” LX200-ACF Advanced Coma-Free catadioptric telescope with UHTC multicoatings puts altazimuth mount research-grade optics into the permanent observatory domes of serious amateur astronomers, schools, and colleges at a surprisingly down-to-Earth price. The Meade LX200-ACF is a modified catadioptric version of the reflector design used in many of the world's largest research telescopes, including the twin 300” Keck scopes and the Hubble Space Telescope . . .





. . . our 34th year