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Focal Reducer

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What is a focal reducer?

Focal Reducer

A focal reducer reduces the telescope's focal ratio by a factor depending on the reducer itself. Simultaneously, the lens system helps to flatten the field, significantly improving edge-of-field corrections. For example, an f/6.3 focal reducer allows a reduction of photographic exposure times by about 50%, while producing an actual field diameter of 1.5" at the film plane.



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Jennifer Mathes, Ph.D.