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Designed specifically for their 9.25" EdgeHD optical tube assembly (OTA), the Celestron 0.7x Focal Reducer Lens
speeds its focal ratio from an f/10 to a much faster f/7.1 for
drastically reduced exposure times with the same results, and wider
fields of view. The reducer maintains the EdgeHD optic's flat-field
performance through the use of a 4-element lens system using Lanthanum
glass, with blackened edges, and anti-reflection fully multi-coated
optics. The Reducer is made to attach directly to the back of the EdgeHD
OTA which keeps the same back focus for cameras and accessories so
there is no need for new gear. A 60mm clear aperture is optimized for
larger full-frame sensors to avoid vignetting of the scene.