The Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (RASA) is specifically designed for astrophotography and astro-imaging with a large aperture and fast focal ratio. Using four-element rare-earth optical glass lenses ensures accurate color rendition and eliminates aberrations such as coma and field curvatures. The improved StarBright XLT multi-coating system, which includes anti-reflection coatings on the lenses and highly reflective coatings on the mirrors, increases light transmission throughout the entire optical path. An integrated fan reduces cooldown time and provides optimal airflow through the optical tube assembly (OTA) while filtering harmful dust from the interior.

The astrograph design is defined by its fast focal ratio, which reduces exposure times without sacrificing image quality and gives you more time for multiple shots of the same object for layering or with different filters. Its internal Ultra-Stable focusing mechanism enables very precise focusing to clearly resolve topographic details on the Moon or split double stars and reveal details of most other celestial objects in between, while minimizing unwanted lateral movement of the primary mirror when focusing or slewing. Since this OTA is designed as an imaging scope, a 42mm camera T-adapter and C-mount imager adapter are included that are compatible with most camera-specific T-rings that are widely available.

Patented Catadioptric Astrograph Design    400mm Focal Length/ f/2 Focal Ratio    StarBright XLT Optical Coating System    4-Element Rare-Earth Optical Glass    Ultra-Stable Internal Focusing Mechanism    Motorized Computer-Controlled EQ Mount    NexStar+ GoTo Hand Controller    40,000+ Database, User-Defined Objects    Multiple Alignment Procedures    Adjustable 2" Stainless Steel Tripod

• 203mm (8") diameter aperture enables near- and deep-sky viewing without being prohibitively large or heavy for easy transport to viewing locations
• 400mm focal length helps to produce a fast focal ratio
• Fast f/2.0 focal ratio requires significantly lower exposure times versus slower ratios to produce the same results
• Rowe-Ackermann Schmidt astrograph (RASA) design is purpose built for astrophotography and imaging performance, and is not recommended for visual use
• Proprietary StarBright XLT fully multi-coated optical system
• Four-element rare-earth glass for true color rendition without aberrations across the entire field of view
• Wide 390-800nm spectral range improves images of deep space objects like galaxies and nebulae
• Image circle: 22mm (0.86")
• Resolution: 0.68 arcsec (Rayleigh), 0.57 arcsec (Dawes)
• Back focus: 25mm (0.98") with included camera adapter, 29mm (1.14") from top of threaded collar
• Optical window can be removed and replaced with optional filters such as a light pollution filter
• Integrated cooling fan brings optical system to ambient air temperature for better performance
• Runs on eight user-supplied AA batteries or optional 12VDC power adapter

• Multi-layer mirror coatings made from layers of aluminum, SiO2 (silicon dioxide), and TiO2 (titanium dioxide)
• Reflectivity is flat across the light spectrum, for both astrophotography/astro-imaging
• Multi-layer anti-reflective coatings made from layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide)
• High-transmission water white glass corrector lens with 97.4% light transmission

• Focusing system moves primary mirror forward and back to achieve tack-sharp images
• Ultra-stable design minimizes unwanted lateral movement of the primary mirror when focusing or slewing
• Fine adjustments for precise focusing, approximately 30 turns of the knob runs through the focus range

• OTA only, mount and tripod required for proper use
• Includes large CGE/Losmandy-D dovetail plate for use on larger more stable mount heads
• Weight: 17 pounds

• Standard M42 camera T-adapter accepts most camera-specific T-rings to directly mount DSLR and mirrorless cameras
• CCTV/Imager C-thread adapter accepts most camera-specific video T-rings to mount imaging and video cameras
• Battery pack takes eight user-supplied AA batteries to power the integrated cooling fan

Related Questions and Answers

Q: 1. Can this telescope also be powered from a mains lead or is it battery only?

A: While this telescope comes with AC adapter for charging, Celestron specifies using only battery power (though not while charging) for the evolution series telescopes.

Q: 2. I have seen these scopes SE 8 that a user could put in RA and Dec coordinates to go directly to a desired object. Is that still the case?

A: That is one of the ways to position it.

Q: 3. is it posible to use 2" eyepieces with this telescope ..?

A: With the proper adapter a 2" eyepiece could be used in the Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail) BH #CEC11AXLT • MFR #91036-XLT

Q: 4. How do I attach Sony a7r iv to this?

A: You need 2 adapters. B&H # CETAC5 MFR # 93633-A plus Vello T-Mount Lens to Sony E-Mount Camera Lens Adapter BH #VELANEXT • MFR #LA-NEX-T

Q: 5. need Manual to repair a Celestron Nexstar: is it available on-line?

A: Yes there is. Here is a link: http://bit.ly/2blTcYI

Q: 6. Does the telescope come already in the Hard Case in this kit or do the come separately packed?

A: This question is a double of the prior question.

Q: 7. Can you see planets close up with this telescope or are they far away?

A: It would be very possible to see the planets Please understand that a lot will depend on the magnification of the eyepiece and the planets orbital position to the earth

Q: 8. Does this telescope come with a Tripod? if so what kind of Tripod is it, specs says No tripod?

A: The Celestron CPC Deluxe 800 HD 8" f/10 Schmidt-Cassegrain Telescope BH #CE110071 • MFR #11007-1 does not come with a tripod. Celestron Heavy Duty Tripod for CPC, Nextar GPS BH #CEHDT • MFR #93493 https://www.bhphotovideo.com/c/product/546204-REG/Celestron_93493_Heavy_Duty_Tripod_for.html

Q: 9. What is the minimum and maximum height of the tripod with the legs spread out, and how tall is the alt-az mount?Thank you for answering my question.

A: It is 22 -40 .

Q: 10. What is the difference between Celestron C11-A and Celestron C11. Does Celestron C11-A have any improvements?

A: Sorry but B&H no longer has a listing for the Celestron C11. only the Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail) BH #CEC11AXLT • MFR #91036-XLT