How wide of a lens can be used on a 6x9 before a center filter is needed? I'm co nsidering lens in the 45-55mm range,to use on an Arca 6x9 F-Line. Will I need a center filter if I use the Rodenstock APO-Granagon 55mm f/4.5 with either a 6x7 or 6x9 format and camera movements??? Good center filters are very pricey items . I'll buy one if I need it, but if I don't all the better. Thanks. Bob P.
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