I have three small lenses that do not have threads for filters, they are approximately 29mm diameter (if they had filter threads, they would be 29mm). Only one, the Ektar 203/7.7 has thread for a filter (?), it is about 39mm. What filter system can I get. I am mostly interested in using Graduated Neutral Density filters and CPL. I posted the same question somewhere in here, but I cannot find it.
Thanks, Pepe.
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