Celestron CGX Equatorial 800 HD Telescopes Whitepaper EdgeHD Optics - Page 20

Celestron EdgeHD 1400 Celestron EdgeHD 1400 In the matrix spot diagrams, note the tight cluster of rays in green light, and the well balanced spherochromatism in the blue and red. These spots are far better than spots from a fine apochromatic refractor of the same aperture. In green light, the EdgeHD 1400 is diffraction-limited over a 28mm image circle, although atmospheric seeing enables it to display its full resolution only on the finest nights. Relative illumination is 100% across the central 16mm, and falls slowly to 83% in the extreme corners of a full-frame 35mm image sensor. We have seen excellent results when the 14-inch EdgeHD is used with a KAF-16803 CCD camera over a 50mm circle. The EdgeHD 1400 is a massive telescope, well suited to a backyard observatory or well-planned away-from-home expeditions. Its long focal length and large image scale offer skilled imagers the opportunity to make images not possible with smaller, less capable telescopes. 20 I The Celestron EdgeHD