Celestron C11 XLT OtaCelestron Schmidt Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount. Each OTA is made to the same exacting standards as those used on all our high quality telescopes. All optical surfaces are coated with Celestrons high efficiency StarBright multi layered coating group. Available with Losmandy type dovetail bars. GENERAL FEATURES: 11" Schmidt Cassegrain Optical Tube Assembly Aluminum Optical Tube

5-pound counterweights and a counterweight extension bar

Tracking Mode: Equatorial or Alt-Azimuth

Periodic Error Correction: Permanently Programmable

25″ adaptors use a thumbscrew which pushes the inserted accessory to one side when tightened

Listing 1 is a 5kg Counterweight

25” nosepiece adaptor or via a T-thread

Angular Field of View: 4

while cutting most of the annoying and contrast-robbing violet fringe that plagues all achromats

Objective Lens Diameter: 90mm

The telescope OTA can be quickly and easily separated from the base unit for convenient transportation

Bahtinov masks are adjustable to fit a wide range of optical tubes

About the Mount