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DPChallenge Forums >> Hardware and Software >> Help with filters
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06/12/2006 11:51:03 AM · #1
I wanna buy a polarizer, but I have no idea what to buy. What is the deal with thread size? Which one should I get? Does it depend on the lens, the camera? Is this a stupid question? :)

Based on my lenses, which thread should I get?
Thanks!

06/12/2006 11:57:52 AM · #2
You need a circular polarizer because the linear kind will throw off the metering in your camera. (if it doesn't say circular polarizer or CPL, it isn't).

You should also get a multicoated polarizer to reduce internal reflections and to allow more light through the polarizer.

The front of your lens should have a circle with a slash through it (sort of like this Ø ) and a number. That is the filter diameter (ie filter size) in mm. If your lenses have different filter sizes, but they're not too far appart, get a CPL for the biggest size, and "step-down" rings for the smaller ones (unless money is no object, then get the correct sized CPL for each lens).
06/12/2006 02:35:47 PM · #3
oh, ok..got it. Thanks a lot :)
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