B+W 77mm Circular Polarizer Multi-Resistant Coated (MRC)

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Originally Posted by neuroanatomist

Have you considered the new(ish) XS-Pro mount from B+W? It's a slim filter, but has front threads so the Canon cap will attach (although not fully down - there's one less turn of the threads on the mount, compared to the F-Pro mount).

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Yes, I found out about that a little while ago. It is worth considering, to be sure. Do you have one?