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Celestron F/6.3 Focal Reducer Placement



    In reference to the correct placement of a F/6.3 focal reducer when added to one's imaging train, (my Canon 450D in the diagram) I comprised the above illustration.  A couple of references are cited below for a better understanding of the placement with other cameras or accessories.

    For the Celestron reducer with a focal length of 285mm working at f/6.3, the spacing is 105mm. For aftermarket uses the compression ranges from about 0.7 at 50mm spacing to about 0.5 at 225mm spacing.


    For the Antares reducer/flattener, with a focal length of 220mm working at F/6.3, the spacing is 81mm.


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