Celestron C11 Optical Tube Assembly with CGE Dovetail: Advanced Astronomy at Your Fingertips

The Celestron C11 Optical Tube Assembly redefines your astronomical experience, combining powerful light-gathering capabilities with the convenience of a portable design. This 11" Schmidt-Cassegrain Optical Tube (OTA) is a marvel of optical engineering, featuring Celestron's premium StarBright XLT coatings for unparalleled clarity and contrast. With a substantial 2800mm focal length (f/10), this telescope excels in delivering crisp, high-contrast views, making it an ideal tool for both amateur astronomers and astrophotography enthusiasts.

The durable and lightweight aluminum tube, measuring only 24 inches in length and weighing 27.5 pounds, makes it easy to transport to your favorite dark sky locations. The C11 is Fastar compatible, offering more versatility for astro-imaging and allowing for the capture of faint galaxies and nebulae with shorter exposure times. Included with the OTA are a 40mm eyepiece, a 9x50 optical finderscope, a star diagonal, and a 1.25” visual back, along with a CGEM-style dovetail bar for easy mounting on various computerized telescope mounts.

The C11's potential is further enhanced with the addition of Fastar technology. Developed in collaboration with the Santa Barbara Instruments Group (SBIG), Fastar transforms the Schmidt-Cassegrain's optical system by allowing for the removal of the secondary mirror and replacement with a field-flattening lens assembly. This setup enables the use of a CCD camera at the telescope's f/2 focus, significantly reducing exposure times and capturing stunning astro-images.

Celestron's StarBright XLT is an advanced optical coating system that stands out in the telescope market for its high transmission rates and consistent performance across the light spectrum. Its unique multi-layer mirror coatings, anti-reflective coatings, and the use of high-transmission water white glass for the corrector lens, ensure an average light transmission of 97.4%, making it one of the finest optical coatings available.

For more information about the Celestron C11's Fastar technology and StarBright XLT coatings, and to see how this optical tube can elevate your celestial observations and imaging, visit Celestron’s website. This flagship optical tube promises to take your visual observing and imaging to new heights, making it a prized addition to any astronomer's collection.

Specifications

OPTICAL TUBE INFO:
Optical Design:	Schmidt-Cassegrain
Aperture:	279.4mm (11")
Focal Length:	2800mm (110")
Focal Ratio:	f/10
Focal Length of Eyepiece 1:	40mm (1.57")
Magnification of Eyepiece 1:	70x
Finderscope:	9x50
Star Diagonal:	1.25" Star Diagonal
Optical Tube:	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 (Compared to human eye):	1593x
Secondary Mirror Obstruction:	95mm (3.75")
Secondary Mirror Obstruction by Diameter:	34%
Secondary Mirror Obstruction by Area:	12%
Optical Coatings:	StarBright XLT
Optical Tube Length:	610mm (24")
Optical Tube Diameter:	312.42mm (12.4")
Optical Tube Weight:	27.5 lbs (12.4 kg)
Dovetail:	CGE Dovetail Bar
Solar Warning	Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
California Residents	WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Software and Documentation

DRAWINGS:
11" Schmidt-Cassegrain Optical Tube Assembly Dimensional Drawing
OTHER PRODUCT FILES:
SCT & EdgeHD Collimation Guide
How to Align a Red Dot Finder to Your Telescope Video
Solar Safety Warning
What are the Sizes of Collimation Screws

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Celestron C11 OPTICAL TUBE ASSEMBLY (CGE DOVETAIL)

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