brianentz
Member
I have an old (1920's) Goerz Dagor 210mm F6.8 lens that I've just recently gotten and am trying to find the best way to use BW contrast filters with it and, I suppose, a polarizer as well. I picked up a 30.5 step up ring but now I see that it won't thread to the front of the lens. I may try a 30mm > step up ring next, but I'm wondering if these old lenses were never meant to have filters threaded on the front? Any input?
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