Optical Tube Assemblies

Celestron C-11A OTA with Starbright XLT.

11" Schmidt-Cassegrain Optical Tube AssemblyAluminum Optical TubeCelestron's premium StarBright XLT coatings2800 mm focal length (f/10)40 mm eyepiece included (70x)Visual back allows for use with 1

Celestron's C5 Spotting Scope is a 5" (127mm) aperture, 1250 mm f/10 Schmidt-Cassegrain optical system. Its optical excellence is the reason it was chosen by NASA for many space shuttle missions.

This is a discontinued item. We suggest the C6 Acromat Refractor OTA as a replacement.

An excellent choice for the serious astronomer, the C6-R is the largest telescope in its class with over 6 times the light gathering ability of a 60mm

• 1.25" focuser
• Mounting rings
• 6x30 Finderscope
• 20mm Plossl

This magnificient optical tube from Celestron has an aperture of 9.25" that features Starbright XLT coatings. The C9 1/4-A XLT CG-5 OTA is a 9.25" OTA that excels at capturing every bit of light it can with its Schmidt-Cassegrain design. The coatings on the lens and the mirrors help reflect every bit of light possible as light moves through the optical internal components.

• 8" EdgeHD Optical Tube Assembly
• Includes dovetail rail compatible with CG5 mount
• Aluminum Optical Tube
• Celestron's premium StarBright XLT coatings
• 2032 mm focal length (f/10)
• 40 mm eyepiece included (51x)
• Visual back allows for use with 1.25" accessories
• 9x50 finderscope to help accurately find objects
• Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
• Mirror Support Knobs hold the mirror in place and reduces image shift during imaging.
• Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror.
• Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging

FOCAL LENGTH - 2350 mm f/10 OPTICAL COATINGS - Starbright XLT OPTICAL DESIGN - Aplanatic Schmidt

is an aplanatic Schmidt telescope designed to produce aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma, but also to give an astrograph quality flat focal plane all the way to the edge of the field of view.