Celestron Red. lens 0.7x f. 800 Edge

Reducer for 800 Edge-HD The EdgeHD Reducer offers optics specially designed for EdgeHD telescopes with five optical elements (including lanthanum glass), while retaining the flat field of view of EdgeHD optics. In contrast to simpler reducers for the APS format, Edge-HD reducers do not shorten the original backfocus of 146 mm. This means that not only any DSLR camera can be connected, but also all known CCD cameras with filter wheels and (AO) active optics systems and off-axis guiding adapters. The 0.7x EdgeHD reducers contain lenses with an extreme refractive index, including lanthanum lenses with very low dispersion. As a result, the particularly high contrast of the EdgeHD optics remains undiminished despite the many additional lenses and there is no chromatic aberration over a very wide spectral range. Each glass-air surface in this lens system is multi-coated to maintain maximum transmission and color fidelity. All lens edges are carefully blackened to completely suppress internal reflections. The large lenses with a diameter of up to 60mm enable a fully illuminated image circle with a diameter of 42mm - also suitable for large CCD sensors. The elaborately CNC-milled aluminium housing ensures exact spacing and precise alignment of the lenses. Metal screw caps protect the lenses from dust and damage when the Edge-HD reducer is not in use. Together with the f/2 HyperStar option and the f/7 Edge-HD reducer, the f/10 Celestron EdgeHD Schmidt-Cassegrain optics are by far the most versatile telescope optics in their price class. Allows the use of existing EdgeHD T-adapters with or without Edge-HD reducer