Celestron Red. lens 0.7x f. 800 Edge

Reducer for 800 Edge-HD

The EdgeHD Reducer features optics specifically designed for EdgeHD telescopes, consisting of five optical elements, including lanthanum glass, while maintaining the flat image field of the EdgeHD optics. Unlike simpler reducers for APS format, the Edge-HD Reducer does not shorten the original backfocus of 146 mm. This allows for the connection of any DSLR camera as well as all known CCD cameras with filter wheels and active optical systems, as well as off-axis guiding adapters.

The 0.7x EdgeHD Reducers include lenses with an extremely high refractive index, including lanthanum lenses with very low dispersion. As a result, the particularly high contrast of the Edge-HD optics is preserved despite the many additional lenses, and there are no chromatic aberrations across 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 diameters of up to 60 mm, enable a fully illuminated image circle with a diameter of 42 mm, suitable for large CCD sensors. The intricately CNC-machined aluminum housing ensures precise spacing and accurate 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 become the most versatile telescope optics in their price range. It allows the use of existing EdgeHD T-adapters with or without the Edge-HD Reducer.