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Large 11 inch Schmidt-Cassegrain telescope tube with Starbright XLT coatings and dovetail bar

Celestron

Celestron C11-A 11" Optical Tube Assembly Starbright XLT Dovetail Slide Bar CGE Mount

SKU CH-S4C5-DEHSX

An 11-inch Schmidt-Cassegrain optical tube with 279 mm aperture, 2800 mm focal length, f/10 ratio, Starbright XLT coatings, a 9x50 finderscope, and a dovetail bar for CGE mounts

  • Large 279mm aperture gathers abundant light for bright celestial views
  • Starbright XLT coatings on all surfaces maximise transmission and contrast
  • 2800mm focal length at f/10 suits planetary and deep-sky observation
  • 9x50mm finderscope enables fast, accurate object location
  • Dovetail slide bar fits CGE mounts for secure, quick setup

Optical tube overview

The Celestron C11-A is an 11 inch Schmidt-Cassegrain optical tube assembly designed for astronomical observation. Its 279mm aperture gathers substantial light for detailed views of planets and deep-sky objects. The Starbright XLT coating system enhances transmission across all optical surfaces for high contrast images. A 9x50mm finderscope is included to simplify target acquisition.

Installation notes

The supplied dovetail slide bar fits directly onto a CGE mount for secure attachment. Balancing the 11 inch tube on the mount is straightforward once the bar is locked in place. The 9x50mm finderscope attaches to the integrated bracket and requires alignment with the main optics before first use. No special tools are needed for basic assembly.

Suitability guide

This optical tube suits observers who want a long 2800mm focal length at f/10 for high magnification planetary work and deep-sky imaging. It is not for users who need a shorter focal ratio for wide-field photography. Buyers without a compatible CGE mount must source one separately. Visual observers seeking a more portable instrument may prefer a smaller aperture.

Highlights

  • Large 279mm aperture gathers abundant light for bright celestial views
  • Starbright XLT coatings on all surfaces maximise transmission and contrast
  • 2800mm focal length at f/10 suits planetary and deep-sky observation
  • 9x50mm finderscope enables fast, accurate object location
  • Dovetail slide bar fits CGE mounts for secure, quick setup

Specifications

No published specifications for this item yet.

Questions about this item

How can I verify the 279mm aperture is delivering sharp planetary views after first light?

Centre a bright star, defocus slightly and check for concentric diffraction rings; symmetrical rings confirm the Schmidt-Cassegrain optics are collimated and the Starbright XLT coatings are transmitting cleanly.

What accessories ship with the tube and what must I source separately?

The box includes the 11-inch optical tube, a 9x50mm finderscope and a CGE-format dovetail slide bar; you still need a compatible mount, eyepieces, a diagonal and a power supply for the mount.

Which focal ratio suits deep-sky imaging versus planetary work with this 2800mm focal length?

The native f/10 focal ratio favours high-magnification planetary observation; add a compatible focal reducer to reach faster ratios for wider-field deep-sky imaging.

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