I have two lenses with the same threading: El Nikor 210mm and Ronar CL 480mm f11. I need retaining rings for each but wish to avoid paying ($85) to have them made. Surely somewhere there is a prefabricated one for sale.
By the way, I found that they matched by checking them against a friend's ring and I do not know the exact size of the threading; if someone knows this (as it seems it may have been a standard size) please inform me and thanks in advance for the kindness.
Cheers,
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