Celestron - 9.25" EdgeHD (Optical Tube) mount By using flats

By using flats

Fine-optically polished glass to ensure accurate 1/4 wavefront and highest parallelism over the both surfaces

Thanks to the StarBright XLT coating

and gas nebulae are located and shows them to you at the touch of a button

Red light bar can be switched on as an orientation aid in the dark

Celestron - 9.25" EdgeHD (Optical Tube) mount By using flatsThe EdgeHD optics (Edge High Definition) combine the compact design of a Schmidt Cassegrain with significantly improved imaging at the edge of the image. This optical system not only offers the properties of astrographs, but also produces completely undistorted, sharp images right up to the edge of the large visual and photographic field of view. Not only is the coma outside the optical axis corrected as with other "coma free" optical designs