I have lots of lenses and they all have different filter sizes. I standardized on the largest, 77mm, and got step up rings (the smallest is 40.5mm) for all the rest. All of my round glass filters are 77mm. My Cokin system has a 77mm adapter. So I have a set of frequently used 77mm glass filters, and a set of Cokin P filters adapted to 77mm. Not too complicated.
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