Celestron EdgeHD 9.25' f/10 Aplanatic Schmidt-Cassegrain Telescope (OTA Only)

Engineered to deliver sharp and clear distortion-free views, the Celestron EdgeHD 9.25" f/10 Aplanatic Schmidt-Cassegrain Telescope is an ideal choice for observation, astrophotography, and imaging objects within or beyond our solar system. It features an aplanatic Schmidt-Cassegrain optical system consisting of a corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field-flattening lenses integrated into the baffle tube. Complementing the EdgeHD system is the proprietary StarBright XLT optical coating system, which improves light transmission and reflectivity across the entire visual spectrum. The combination of EdgeHD and StarBright XLT produces bright and clear high-resolution images with true color rendition across the entire field of view without distortion, aberrations, or off-axis comas.

Optimized for imaging, the internal focusing system features mirror support clutches to ensure proper alignment and mirror locks to avoid accidental defocusing during long-exposure astrophotography. The optical tube is outfitted with an oversized 2" visual back to ensure large imaging sensors are completely covered to avoid vignetting. For visual observations, a 2" star diagonal is included along with a 23mm wide-angle eyepiece that yields a 102x magnification. A reducer adapter is provided to allow the use of smaller and more common 1.25" eyepieces and accessories. The EdgeHD 9.25 is offered here without a mount or tripod for users who already have a reliable support system and are looking to upgrade or add to their existing gear, but it comes with a large CGE dovetail plate that is compatible with Losmandy saddles.

Optical Tube

• 9.25" (235mm) aperture
• f/10 focal ratio
• 2350mm effective focal length
• Aplanatic Schmidt-Cassegrain optical design
• EdgeHD field-flattener aplanatic design eliminates spherical aberration, field curvature, and off-axis star coma to improve resolution, sharpness, and clarity across the entire field of view, especially at the edges
• Diffraction-limited SCHOTT glass reduces internal light loss to improve color, clarity, and sharpness
• StarBright XLT optical coatings
• Flexible tension clutches hold the primary mirror in place to reduce image shift without putting any force or pressure on the mirror assembly, keeping subjects centered
• Internal mirror locks prevent accidental adjustment to focusimportant during long-exposure astrophotography
• Integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror without dust getting in, to prevent mirror distortion due to uneven surface temperatures
• Resolution: 0.59 arcsec (Rayleigh) 0.49 arcsec (Dawes)
• Secondary mirror obstruction: 3.35" (85mm) 36% by diameter 13% by area