Optical Tube Celestron EdgeHD XLT 11 (CGE) (SKU: 91050-XLT) optical tubes OTA opinie

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Schmidt-Cassegrain telescope with an aperture of 279mm (11") and a focal length of 2800mm. This is an aplanatic version with a modified aspherical correction plate and modern StarBright XLT coatings. Edge HD technology allows for a flat and flawless field of view, ideal for astrophotography. The new system in particular reduces coma and improves resolution at the edge of the field of view. This allows for excellent results even with large format CCD cameras - correct images are obtained for matrices with a diagonal of up to 52mm.

Compared to previous versions, the Edge HD tubes also have a number of mechanical improvements. Among other things, the mounting of the primary mirror has been improved, eliminating the so-called mirror shift.

The rear part of the tube has ventilation holes with special filters that prevent dust from getting inside the tube. In addition, these holes speed up the process of equalizing the temperature inside the tube with the ambient temperature, which is of paramount importance for the quality of the image obtained.

All Edge HD telescopes are equipped with the Fastar system, which allows the CCD camera to be placed directly in the telescope's primary focus. The collimation procedure has also been simplified, which can now be performed with knobs without the use of tools.

Technical parameters

• Catalog Number: 91050-XLT
• Telescope optical system: Schmidt-Cassegrain
• Mounting type: No mounting
• Aperture: 279 mm
• Focal length: 2800 mm
• Light intensity: f/10.0
• Stellar range: 14.8 magnitude
• Maximum usable magnification: 558 x
• Maximum resolving power (Rayleigh): 0.51 "
• Maximum resolving power (Dawes): 0.42 "
• Collective capacity: 1589 x
• Tube weight: 13.0 kg
• Tube length: 610 mm
• Tube diameter: 312 mm
• Focuser type: SCT/MAK
• Focuser diameter: 2 "
• Secondary mirror diameter: 95 mm
• Central obstruction: 34%
• Coatings: StarBright XLT
• Mounting rail: Losmandy
• Warranty period: 36 months