Alley in Pisa, Italy

by Lars Kotthoff

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7
votes
3answers
798 views

How can I fix a sticky polarizing filter?

I took a gamble and bought a used B+W Circular Polarizer off eBay. The filter looks great but the adjusting ring is a little bit sticky. Is there some way to lubricate this?
7
votes
3answers
712 views

How to tell if a polarizing filter is too damaged?

I dropped my CPL onto some rocks and it's a bit scratched up. There's no obvious effect in a (very cursory) look at the photos, but are there tests I can do to see if the damage has a visible effect?