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Shorten your astrophotography exposure times and expand your field of view with this from ZWO. Compatible with ZWO FF107APO and FF130APO optical tube assemblies, the reducer features three lens elements, including one made of extra-low-dispersion glass. When used with the FF107APO OTA, the reducer cuts the focal ratio from f/7 to f/4.9 and the focal length from 749 to 524mm. It produces a 55mm back focus and comes with M68, M54, and M48 threaded adapters.
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