TAKAHASHI 645 SUPER REDUCER FOR CCA-250 GSO-IP Depth of M48 thread 4

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TAKAHASHI 645 SUPER REDUCER FOR CCA-250 GSO-IP Depth of M48 thread 4The Takahashi 645 Super Reducer is a 0. 72x focal reducer for the CCA 250 corrected Cassegrain astrograph. The 645RD reducer has a large image circle of 60mm, making it suitable for use with medium format sensors. The 0. 72x reduction factor reduces the focal length to 890mm and focal ratio to f 3. 6, transforming the CCA 250 into a high performance super astrograph. The 645RD Reducer consists of four large diameter lenses in four groups, giving

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