I am in need of a 49mm retaining ring for a 210mm eskofot ultragon I scored recently. I know Grimes will make me one for $35, but alas, I am a cheap bastard and don't want to pay more for the ring than I did the lens. I do have a bunch of retaining rings and flanges, none of which fit my lens. I would love to trade some for a 49mm ring!
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