Celestron NexStar 11 GPS Telescopes

Celestron NexStar 11 GPS Telescope - The largest aperture of the Celestron GPS telescope line, Celestron NexStar 11 GPS Telescopes (with Start Bright XLT coating and without it), have the most light gathering power and has a limiting magnitude of nearly 15. The NexStar 11-GPS takes full advantage of its vast database of thousands of NGC and Abell galaxies as well as delivering a new level of detail to all your favorite deep sky objects.

With sophisticated software features like Hibernate function, Celestron Telescope 11GPS can maintain its star alignment night after night without needing to be re-aligned, making it an ideal instrument for a permanent observatory facility.

Celestron NexStar 11 GPS Telescopes with SarBright XLT coating : (models 11053-XLT and 11053-XLT-A)

With StarBright XLT Optical System Design you'll see the light. One of the most important factors in the evaluation of a Schmidt-Cassegrain telescope 's optical system performance is its transmission - the percentage of incoming light that reaches the focal plane. The design of the XLT System accomplishes two crucial objectives: Develop a coating system that is optimized for visual use and for CCD/Photographic imaging.

There are three major components that make up Celestron StarBrightXLT high transmission optical system design:

1) Unique enhanced multi-layer mirror coatings: Celestron mirror coatings are made from precise layers of Al (Aluminum), SiO2 (quartz) and TiO2 (Titanium Dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both CCD imaging and visual use.

2) Multi-layer anti-reflective coatings: Coatings are made from precise layers of MgF2 (Magnesium Fluoride), and HfO2 (Hafnium Dioxide). Hafnium gives a wider band pass than Titanium, used in comparable coatings.

3) High Transmission Water White glass : Celestron Schmidt-Cassegrain optical systems with optional StarBright XLT coatings use Water White glass instead of Soda Lime glass for the corrector lens. Water White glass transmits about 90.5% of light without anti-reflective coatings. That is 3.5% better transmission than uncoated Soda Lime glass. When Water White glass is used in conjunction with StarBright - XLT 's anti-reflective coatings, the average light transmission reaches 97.4% - an 8% improvement!

These three components of Celestron StarBright XLT coatings result in one of the finest coatings available. The peak light transmission for the systems is 89% at 520 nm. The overall system transmission is 83.5% averaged over the spectrum from 400 to 750 nm.

Click here to see details about StarBright XLT .

Specifications for Celestron Nex Star 11 GPS Telescopes :

Design:		Schmidt-Cassegrain Catadioptrics
Aperture:		11" (279 mm)
Focal Length:		2800mm
F/ratio of the Optical System:		10
Central Obstruction:		3.75"
Highest Useful Magnification:		660x (~4mm eyepiece)
Lowest Useful Magnification(7mm exit pupil):		40x (~70mm eyepiece)
Magnification: Standard Eyepiece ( 40mm Pl):		70x
Resolution: Rayleigh Criterion Dawes Limit:		.50 arc. seconds .42 arc second
Photographic Resolution (theoretic at 410nm):		200 line/mm
Light Gathering Power:		1593x
Near Focus w/ standard eyepiece or camera:		~60feet
Field of View: Standard Eyepiece:35mm Camera:		.66°.72°x.50°
Linear Field of View (at 1000 yds):		34.5 ft.
Optical Tube Length:		25"
Input Voltage:		12 V DC Nominal
Maximum:		15 V DC Max.
Minimum:		9 V DC Min.
Power Supply Requirements:		12 VDC-1.5A (Tip positive)
Cord Management:		Internal Slip Ring Design
Motor: Type Resolution:		DC Servo motors with encoders, both axes .113 arc sec
Slew speeds:		Nine slew speeds: 3° /sec, 2° /sec, .5°/sec, 64x, 16x, 8x, 4x, 1x, .5x
Weight of Telescope:		65 lbs
Weight of Tripod:		26 lbs

Features of Celestron NexStar-11GPS Telescope :

• StarBright Multi-Coatings
• Dual Fork Arm
• Carbon Fiber Optical Tube
• Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit Computer Hand Control
• RS-232 communication port on hand control
• Auxiliary Port and Autoguide Port on Drive Base
• 40,000+ object database
• 16 channel GPS Receiver

Package Contents:

• Celestron NexStar 11 GPS Telescope
• 1-1/4" 40mm Eyepieces (70x)
• 1-1/4" Star Diagonal
• 9x50 Finderscope and Mounting Bracket
• 1-1/4" Visual Back
• AC Adapter (car battery adapter is included with some models)
• Heavy Duty Tripod
• NexRemote Telescope Control Software