Maksutov-Cassegrains

More Information  · Supplied Accessories  · Recommended Accessories  · Images of Some Features Price $399.00 List Price $619.95 Highest Useful Magnification 208x Visual Limiting Magnitude 12.3 Focal Length 1250mm Focal Ratio f/13.89 Resolution 1.29 arc seconds Aperture 3.5" Weight 12 lbs. Warranty 2 years

    Once aligned, the scope’s computer hand control will find more than 4,000 celestial objects for you and will track them unerringly all night long while you observe. With its pre-assembled adjustable height steel tripod and easy no-tool assembly, the NexStar 90SLT can be up and ready to take you on a tour of the Universe in a matter of minutes.

    The 90mm (3.5”) Maksutov-Cassegrain folded catadioptric optical system of the NexStar 90SLT provides exceptional high contrast/high resolution solar system images – major surface details on Mars; multiple storm bands on Jupiter; even Cassini’s Division in the rings of Saturn frequently popping into view in good seeing conditions; and more. Outside the solar system, the high resolution Celestron 90SLT splits close binary stars with ease, resolves open and globular star clusters, reveals the brighter nebulas and galaxies, and more.

    The NexStar 90SLT has all the features and optical performance needed to keep a casual backyard astronomer happily observing for years. And it can be used for terrestrial observing, too – birdwatching, scanning the scenery from the home with a view, and more.

   SLT computer
   SLT mount
   SLT software

This Telescope’s Optical System . . .

• Maksutov-Cassegrain optical system: Aluminum tube 90mm aperture (1250mm focal length f/13.89) folded lens/mirror catadioptric. The system’s Maksutov corrector lens is fully coated on both sides with antireflection material for high light transmission and good contrast. A no-tool quick release dovetail connects the tube to the mount for fast set-up and take-down.

• Finderscope: StarPointer non-magnifying variable brightness red dot finder on a quick-release dovetail mounting bracket. The StarPointer is a quick and easy way to point your telescope exactly to the desired object in the sky. There’s no need to worry about the inverted images you see through traditional finders. Just align the red dot seen in the StarPointer with the desired star in the sky and you’re done.

• Internal focuser: Focuses by moving the primary mirror fore and aft in the optical tube by means of a focusing knob on the rear cell.

• Star diagonal: 1.25" 90° prism type

• Two 1.25" eyepieces: The first is a 25mm providing 50x. The eyepiece field of view is 1° across, twice the diameter of the full Moon for expansive views of the Moon, star clusters, and terrestrial observing. The second is a 9mm providing 139x for close-up views of the Moon and planets, globular star clusters, binary stars and more.

This Telescope’s Mount . . .

• Fork mount/drive system: Single fork arm altazimuth design with pre-installed internal dual DC servo motor drives. A compartment in the drive base accepts eight user-supplied AA batteries for powering the telescope. Selectable lunar, solar, or sidereal (star) tracking rates, with nine different slewing and centering speeds for locating objects (3°/sec, 2°/sec, 1°/sec, and 64x/32x/16x/8x/4x/2x the sidereal rates). For more details, click on the “mount" icon above.

• NexStar computer control: The supplied computer hand control has an illuminated numeric keypad and a two-line 16-character LCD display. It has a database of 4,033 stars and objects, including 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.
      With the built-in SkyAlign technology, lining up your 90SLT on the sky each night takes only minutes. Simply input the date, time, and your location into the computer hand control, then use the StarPointer red dot finder to align the telescope on any three bright stars, or to two stars and a bright planet or the Moon. The NexStar computer will automatically align itself with the sky. Then, 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. For more details, click on the “computer" icon above.

• Supplied software: The scope comes with a CD-ROM of TheSky X – First Light Edition planetarium and star charting software. This program will let explore the Universe on your PC or Macintosh and print out custom star charts of the sky from its 10,000 object database to help you find faint objects that are not in the scope computer’s database. In addition, you also get the NexStar Observer’s List (NSOL) control software. This program lets you connect your SLT scope to your Windows-based laptop or PC (with an optional RS-232 cable). It brings up on your computer screen a list of all the objects it the scope’s database. Simply click on any of the objects in the list and the scope will slew to that object (if it’s above the horizon) and start tracking it for you to observe. For more details, click on the “software" icon above.

• Adjustable height tripod: The preassembled 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 height adjustment lock levers are on the inside of the legs to avoid snagging your clothing on them in the dark.

• Two-year warranty: All Celestron telescopes have a two-year warranty, double that of competitive scopes.