Potentially silly question

Started Aug 22, 2014 | Discussions thread
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Colin Franks
Colin Franks Senior Member • Posts: 1,325
Potentially silly question

Ok ok, this might dumb, but I gotta ask as it's been bugging me.  When putting on a screw-on filter (like an ND or polarizer), is it necessary to screw it in all the way, or is just a couple of hand-turns ok?  I'm wondering if light can get in if it's not all the way in.

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