11" SCT Optical Tube Assembly (CGE)
$3,199.95
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11" SCT Optical Tube Assembly (CGE)
$3,199.95
11 Inch Aperture
Massive Light Gathering Power
StarBright XLT
Maximum Optical Light Transmission
Fastar Compatible
Ultra Fast f/2 Imaging
Aluminum Tube
Rugged Lightweight Portable Design
CGEM Dovetail
Fits Heavy Duty Mounts
2800mm Focal Length
High Contrast Planetary Views
Deep Space Exploration EngineUnmatched Clarity for Visual Observing and Imaging
The Celestron C11-A 11" Schmidt-Cassegrain Optical Tube Assembly delivers exceptional light-gathering capability in a portable, high-performance package designed for serious astronomers. Utilizing patented StarBright XLT optical coatings, this premier telescope optical tube maximizes light transmission to provide brilliant, high-contrast views of faint deep-sky targets and delicate planetary details. Whether mounted for visual observing or advanced astrophotography, the Celestron C11-A offers superior optical excellence that elevates your astronomy experience.
Advanced Precision OpticsUnlocking Deep Sky Wonders with Fastar Technology
Engineered for high-magnification viewing and high-resolution astrophotography, the Celestron C11-A 11" Schmidt-Cassegrain Optical Tube Assembly represents the gold standard in Schmidt-Cassegrain design. Featuring a large 11-inch aperture paired with a versatile 2800mm focal length, this SCT optical tube assembly delivers high-contrast images of the Moon, planets, and distant nebulae. Integrated Fastar technology allows astrophotographers to remove the secondary mirror and mount a camera at f/2 focus, reducing required image exposure times by up to 25 times compared to native f/10 focus. Constructed with a durable aluminum chassis weighing only 27.5 pounds and outfitted with a CGE dovetail bar, the Celestron C11-A telescope seamlessly couples with motorized equatorial mounts for accurate long-exposure tracking.
Technical SpecificationsDetailed Engineering Standards and Performance Metrics
Optical Design
Schmidt-Cassegrain
Aperture
279.4mm (11 in) (eye)
Focal Length
2800mm (110 in) (search)
Focal Ratio
f/10
Optical Coatings
StarBright XLT
Focal Length of Eyepiece 1
40mm (1.57 in) (gear)
Magnification of Eyepiece 1
70x
Finderscope
9x50
Star Diagonal
1.25" Star Diagonal
Optical Tube Material
Aluminum
Highest Useful Magnification
660x
Lowest Useful Magnification
40x
Limiting Stellar Magnitude
14.7
Resolution (Rayleigh)
0.5 arc seconds
Resolution (Dawes)
0.42 arc seconds
Light Gathering Power
1593x compared to human eye
Secondary Mirror Obstruction
95mm (3.75 in) (circle)
Secondary Mirror Obstruction by Area
12% (pie)
Optical Tube Length
610mm (24 in) (ruler)
Optical Tube Diameter
312.42mm (12.4 in) (ruler)
Optical Tube Weight
27.5 lbs (12.4 kg) (weight)
Dovetail
CGE Dovetail Bar
Key Optical FeaturesOptimized Mechanics and Premium Glass Coatings
Aperture Size11" (279.4mm) Schmidt-Cassegrain design (eye)
Optical CoatingsPremium multi-layer StarBright XLT coatings
Fastar CompatibilityConverts from f/10 focal ratio down to f/2 focus
Tube ConstructionRugged and lightweight aluminum tube assembly
Focal Length2800mm focal length for clear planetary magnification
Included Accessories40mm eyepiece, 9x50 optical finderscope, and 1.25" star diagonal
Mount CompatibilityCGEM/CGE-style dovetail bar included
Frequently Asked QuestionsEverything you need to know
What mount is required for the Celestron C11-A 11" Schmidt-Cassegrain Optical Tube Assembly?
The Celestron C11-A includes a wide CGE/CGEM-style dovetail bar, making it directly compatible with heavy-duty computerized equatorial mounts like the Celestron CGEM II, CGX, or similar equatorial mounts capable of supporting at least 30 to 35 lbs.
How does Fastar technology work on the Celestron C11-A 11" Schmidt-Cassegrain Optical Tube Assembly?
Fastar technology allows you to remove the secondary mirror on the front corrector lens and attach a compatible camera system. This converts the telescope from its native f/10 focal ratio to a super-fast f/2 system, reducing exposure times for deep-sky astrophotography by up to 25 times.
What are StarBright XLT coatings on the Celestron C11-A telescope?
StarBright XLT is Celestron's proprietary high-transmission optical coating system. It uses enhanced multi-layer aluminum mirror coatings, multi-layer anti-reflective coatings with hafnium dioxide, and water-white glass to achieve up to 97.4% total optical light transmission.
What accessories are included with the Celestron C11-A 11" Schmidt-Cassegrain Optical Tube Assembly?
The Celestron C11-A package includes a 40mm eyepiece (70x magnification), a 9x50 optical finderscope, a 1.25" star diagonal, a 1.25" visual back, and an attached CGE-style dovetail mounting bar.