Celestron NexStar 90SLT Computerized Telescope

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Your Price: CAD803.72

Retail Price:CAD843.91

Your Savings:CAD40.19(5%)

Part Number: 22087

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Description

Product Highlights

90mm Maksutov-Cassegrain OTA
1250mm Focal Length, f/14 Focal Ratio
Single-Arm Motorized Alt-Az Mount
Fully Multi-Coated Optics
4000+ Object Database Hand Controller
Expanded Information on 200+ Objects
SkyAlign and Other Alignment Modes
Multiple Tour Modes with Filters
3 Tracking Rates and 9 Slew Speeds
Stainless Steel Tripod with Tray

Designed as a highly portable and user-friendly entry- to mid-level astronomical observation platform, the Celestron NexStar 90SLT 90mm f/14 Maksutov-Cassegrain GoTo Telescope gives you the ability to make detailed observations of the Moon, with the ability to easily see planets and reach outside the solar system to resolve bright deep-space objects like galaxies, nebulae, and binary or variables stars. The compact and powerful Maksutov-Cassegrain design uses a front corrector plate with a convex meniscus lens to correct off-axis aberrations, like comas, and chromatic aberration to produce images with true color rendition. The nature of the lens results in a smaller secondary mirror—limiting obstruction and increasing contrast, while eliminating the need for periodic collimation.

The brain of the NexStar SLT is the venerable NexStar computer controller. Equipped with a database of over 4000 objects, including the planets, stars, nebulae, galaxies, and the complete Messier catalog, it can also be programmed with up to 99 custom user-defined objects and filters for custom object lists. Its intuitive menu-driven user interface provides the power to observe the heavens with nine slew speeds and three tracking rates, plus anti-backlash compensation. Features such as guided tours, extended information on 200 popular objects, and multiple assisted alignment procedures make the NexStar controller easy to use and invaluable to new users and experienced stargazers.

Optical Tube

90mm aperture
f/14 focal ratio
1250mm focal length
Maksutov-Cassegrain optical design
Front convex meniscus lens corrects spherical and chromatic aberrations and comas (off-axis aberration) across the entire field of view
Compared to Schmidt-Cassegrains, a smaller secondary mirror reduces obstructions and increases contrast
Fully coated optics improve light transmission, color rendition, and contrast
Resolution: 1.55 arcsec (Rayleigh); 1.29 arcsec (Dawes)
Internal focusing system
Vixen-style dovetail plate

NexStar Controller

4000+ object database
99 customizable user-defined objects
Expanded information on over 200 most popular objects including history, facts, and mythology
Tracking rates: Sidereal, Solar, Lunar
Nine slew speeds: 2x, 4x, 8x, 16x, 32x, 64x, 1°/sec, 2°/sec, 3°/sec
Anti-backlash compensation trains out the intrinsic play between gears to improve GoTo and tracking accuracy
Alignment procedures: Sky Align, Auto 2-star, 1-star, 2-star, Solar system
SkyAlign allows fast and easy alignment without having to polar align or even know the names of stars
Tour mode: Seeks out the best objects and automatically slews to them
Constellation Tour: Tour of the best objects within a specific constellation
Identify mode: Searches the database catalogs or lists and displays the name and offset distances to the nearest matching object
Flash upgradable via Internet
2-line/16-character LCD display with 19 backlit LED buttons
RS-232 communication port for updating or computer control

Database Details:
Solar system: Includes planets, Moon, and Sun
Constellations
50 named deep-sky objects
Stars: Select list of SAO catalog including named stars, asterisms, variable stars, double stars
Abell catalog
IC catalog
Caldwell catalog
Complete Messier catalog
Select objects from the NGC catalog

Mount and Tripod

Mount:
Single-arm fork design
Dual-axis DC servo motors
Optical encoders on motors improve GoTo and tracking accuracy; up to 0.26 arcsec accuracy
Internal battery compartment to prevent cord wrap during use
Hand control and motors are powered by eight user-supplied AA batteries or optional 12 VAC adapter
No-tool setup, complete quick release setup and breakdown

Tripod:
Sturdy stainless steel
Adjustable height accommodates a variety of users and observation positions
Spiked feet improve stability on soft or uneven ground
Movable hand controller holder prevents cord wrap during long-duration observation and astrophotography sessions
Tray holds accessories like eyepieces, filters, phones, and flashlights

Included Accessories

Eyepieces:
1.25"-diameter barrel
Accepts most 1.25" astronomical filters
9mm focal length produces 139x power
25mm focal length yields 50x power

Diagonal:
Eyepiece holder accepts most 1.25" eyepieces and accessories
90° angle places head at a comfortable viewing angle
Star diagonal corrects image horizontally, but not vertically

Finder:
Unmagnified to ensure a wide field of view for finding alignment stars easily
Reticle won't obstruct small objects
Variable-intensity LED protects night-adjusted vision

Software:
NSOL Telescope Control Software: Provides basic telescope control via computer with optional RS-232 cable

Using Celestron’s patented SkyAlign (patent pending), simply input the date, time and location into the hand control then slew the telescope to any three bright celestial objects in the sky. You do not need to know the names of the stars – you can even pick the Moon or bright planets!

Specifications

Optical Design	Maksutov-Cassegrain
Aperture	90mm
Focal Length	1250mm
Focal Ratio	f/13.9
Eyepiece Barrel Diameter	1.25"
Diagonal	90° star 1.25" snout and eyepiece holder
Finderscope	StarPointer red-dot
Mount Type	Motorized single-arm alt-azimuth
GO-TO Capability	Yes
Tripod	Adjustable-height, stainless steel
Power Source	8 x AA batteries
Optical Tube Dimensions	10.0" / 25.4 cm
Weight	Not specified by manufacturer

Packaging Info

Package Weight	26.8 lb
Box Dimensions (LxWxH)	38.7 x 17.2 x 10.2"

In the Box

Celestron NexStar 90SLT 90mm f/14 Maksutov-Cassegrain GoTo Telescope

9mm Eyepiece
25mm Eyepiece
90° Star Diagonal
Computer Hand Controller
Stainless Steel Tripod with Tray
"The Sky X" Astronomy Software
NSOL Telescope Control Software
Limited 2-Year Warranty

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.	Yes
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.	Great
Planetary Observation:	Good
Binary and Star Cluster Observation:	Good
Galaxy and Nebula Observation:	Fair
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.	Yes
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

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