I'm sure this is common knowledge, but I notice quite a bit of vignetting in
my 21mm 2.0 with UV and polarizer filters attached. I've been thinking of
getting a step-up ring such that I can keep the UV filter attached when I need
the polarizer. Any suggestions? 55 to 67? 55 to 72?
Up to now, I've just been swapping them.
Also thinking of getting a thin polarizer to try to "thin down". Does anyone
have experience with this?
Dave
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