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Celestron - EdgeHD 1100 11" Optical Tube Assembly 91050-XLT


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CELESTRON - EdgeHD 1100 11"  Optical Tube Assembly  • 91050-XLT

 The EdgeHD 11 Optical Tube Assembly from Celestron features an Aplanatic Schmidt-Cassegrain optical system. This compound, or catadioptric, light-path employs a combination of mirrors and lenses that offer a large high-resolution aperture, a shorter tube length, and enhanced portability. This telescope has an 11" aperture, a focal length of 2800mm, and a focal ratio of f/10.

The EdgeHD optical system consists of a zero power corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field flattening lenses integrated into the baffle tube. The optics of an EdgeHD telescopes feature StarBright XLT multi-layer coatings on the primary and secondary mirrors for increased reflectivity. The corrector is also fully coated to ensure enhanced anti-reflection characteristics.

The EdgeHD optical system is designed to optimize an image circle with a 42 mm diameter around the center of the field of view. This circle completely covers the diagonal of a full-frame DSLR camera or a standard 35mm film frame. As such, it extends significantly beyond the diagonal of APS-C sensors and the smaller chips used in specialized astrophotography CCD cameras. Further refinement of the system's imaging capabilities is managed via mirror tension clutches that help support the primary mirror and minimize its lateral movement. This enhancement is particularly important to astrophotographers as it significantly improves the system's stability and imaging clarity.

This OTA comes with a very useful 9x50 finderscope fitted to its exterior. Due to its wider field of view, this ancillary optic can offer assistance in locating objects to view with the main scope.

Normal image orientation for the EdgeHD design is upside-down and reversed. The 2.0" diagonal inverts this image so it is right-side-up, but reversed. This diagonal directly accepts 2.0" eyepieces, and a 1.25" eyepiece adapter is included.

Also included in this package is Celestron's Axiom LX 23 mm eyepiece. This ocular is ideal for deep-space viewing - its wide field of view produces a feeling of being surrounded by the viewing experience. 

Optical Performance
Aperture: 11.0"
EFL: 2800 mm, f/10
Aplanatic Schmidt-Cassegrain system for aberration-free imaging
Premium StarBright XLT coatings for enhanced light transmission

Construction Details
Aluminum tube
Mirror support knobs reduce image shift
Filtered tube vents release hot air from behind the primary mirror
Dovetail rail: included in package - compatible with Celestron's CGE mount
Fastar compatible: equipped with a removable secondary mirror for ccd imaging

9x50 finderscope
Angle of view: 5.8°
Assists in locating objects
All mounting hardware is included in kit

Axiom LX 23mm Wide Angle Eyepiece
AAoV: 82°
Eye Relief: 17 mm
Magnification: 122x with 11" EdgeHD
Accepts Celestron's 2.0" thread-in filters
Parfocal design allows for fast switching of eyepieces
Retractable eyecup provides ultra-low profile for eyeglass wearers

90° Diagonal
Accepts 2.0" eyepieces
1.25" eyepiece adapter included
Image orientation: right-side-up, laterally reversed
StarBright XLT multi-layer coatings enhance light transmission
Improved brass clamping ring provides a secure no-mar connection















Product Series

SEE THE UNIVERSE IN HD Introducing Celestron's New Aplanatic Schmidt Telescope Design! visibly Sharper images Superior performance. Enhanced Mechanical features fastar Compatible

EdgeHD 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.



Additional Information

Name Celestron - EdgeHD 1100 11" Optical Tube Assembly 91050-XLT
Manufacturer Celestron
Model CEL-91050-XLT
UPC 050234105095
Manufacturer Part No CEL-91050-XLT
Aperture 279.4 mm (11 in)
Dovetail Compatibility CGE Mount
Eyepiece 1 23 mm (0.91 in)
Finderscope 9x50
Focal Length 2800 mm (110.24 in)
Focal Ratio 10.02
Optical Tube Aluminum
Optical Tube Length 24 in (609.6 mm)
Optical Tube Weight 28 lbs (12.7 kg)
Secondary Mirror Obstruction 3.75 in (95.25 mm)
Secondary Mirror Obstruction by Area 11.6 %
Secondary Mirror Obstruction by Diameter 34.1 %
Star Diagonal 2" w/ 1.25" adapter