I would like to purchase an orange or red filter, 67mm for my old Super-Angulon. This lens is an early non coated one. I don't have a lot to spend. Obviously, adding more glass, especially lesser quality glass to the front of a six element lens like this, could be detrimental to final image. Is an old Tiffen acceptable? There are new Chinese filters on the market, but I am concerned that a new poor quality glass in the front of my old German glass may degrade image. I would appreciate any response from you, on this site, who may have knowledge on this. Thanks, Robert
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