Celestron's 9.25 optical system has enjoyed a loyal following since we first introduced it with our Ultima 9.25 in 1995. Now the 9.25 optical tube is even better with the addition of EdgeHD optics. The 9.25 is a favorite among astro imagers and discerning visual observers, and it offering 33% more light gathering than our 8" model. CPC Deluxe 925 HD is specifically designed for astro imaging and optimized to reduce aberration across a wide field of view. This feature packed model comes standardwith Celestron's renowned StarBright XLT multi-coatings and is compatible with acomplete line of Celestron photographic and visual accessories. New Optical Design The EdgeHD optical system combines all of the compact power popularized by the SCT with an improved high definition optical system for wide field, astrograph quality images. As a visual instrument, EdgeHD optics deliver pinpoint images even with your widest field eyepiece. You can search for all of the Messier Catalog objects, and see hundreds of other NGC, IC and Caldwell objects with amazing clarity. For astro imaging, EdgeHD optics produce aberration-free images across your favorite CCD or DSLR camera. All EdgeHD optics are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of the largest commercial CCD detectors, allowing stars to be in tight focus to the very edge of the chip Internal GPS The CPC Deluxe HD Series' internal G PS receiver automat