I've got a 250 Wide Field Ektar that (should) take Series 9 filters with the hel p of the retaining ring that came with the lens. I picked up a Tiffen Series 9 f rom Ebay ($18), but it won't fit in the retaining ring - its just a smidge too l arge. I could force it into the ring, but I'll never get it out so that's not an option.
I could gently sand the ring of the filter with emery cloth, reducing it exactly 1 smidge to get it to fit, but wondered if anyone has other solutions that I'm not thinking of?
It's only $18 bucks, so I'm not worried about asthetics.
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