I have been learning to use my 75 mm f/4.5 Grandagon-N lens. I work digitally after development with negative film. I planned to correct for illumination fall off digitally, and I think I've figured out how to do it. But there is always the option of using a center filter, particularly if I want to shoot transparencies. The Rodenstock filter costs at least twice as much as third party filters. Are there reasons for choosing the Rodenstock instead of one of the less expensive filters?
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