Celestron C11-S XLT OTA CGE with Losmandy-style dovetail (SKU: 91036-XLT) optical tubes OTA opinie

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A Schmidt-Cassegrain optical tube with a diameter of 280 mm and a focal length of 2800 mm. The optics consist of a primary mirror, an aspherical corrector plate, a secondary mirror, and a diagonal with an eyepiece. Schmidt-Cassegrain telescopes generally have shorter focal lengths than Maksutov telescopes and are more versatile. This is especially true for telescopes with a focal length reduction down to f/6.3 using a special focal reducer mounted in the focuser. SCT telescopes are short, relatively lightweight, and, with large apertures, more practical than Newtonian telescopes. Focusing is performed, as in Maksutov telescopes, using a knob on the rear of the telescope. Turning the knob shifts the telescope's mirror forward or backward, which changes the focal point at the exit of the optical tube. The telescope is equipped with the StarBright XLT system. Light transmission increases by 16% compared to traditional coatings!

Technical parameters

Equipment

The set includes the following accessories:

• 40 mm / 1.25" eyepiece (over 70x)
• 1.25" focuser, internal focusing (mirror)
• 90° angle connector 1.25"
• integrated Losmandy/CGE style dovetail
• 9x50 optical finder

Applications

Moon

planets

nebulae

airplanes

landscapes

Guarantee

2 years

(below: photos of the 8" version with a smaller finder than the 11" version)

FIELD TESTS

OBJECT : Moon (craters: Copernicus, Ptolemaeus, Alphonsus, Arzachel, Purbach, Regiomontanus, Walther, Deslandres)
SETUP
Main Telescope: Celestron Schmidt-Cassegrain C11-S (280/2800 mm)
Main camera: ZWO ASI462MM-V2
Installation: EQ-ATM
Filter: Baader IR-pass 685 nm
Software: FireCapture 2.7, Autostakkert!4, ImPPG
Completion date: August 15–16, 2025
Author: Jerzy Ł±giewka