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Forum: Pentax DSLR Discussion
12-14-2007, 10:27 PM
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That's a real good question. Beyond mount thickness, multi-coating seems to be the primary difference between the expensive and less expensive filters. Given polarizers are used most often at angles to the sun (not with the sun falling directly onto the filter causing flare), has anyone actually found a situation where multi-coated polarizers truly work better then single-coated polarizers?
I believe my less expensive Tiffen polarizer is not multi-coated, without any problems so far. But that alone doesn't mean there will never be problems.
stewart
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Forum: Pentax DSLR Discussion
12-14-2007, 08:25 PM
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I agree with Arpe's "maybe" option. A linear polarizer would probably work just fine perhaps 99% of the time, but always with a tiny chance it will screw things up in difficult or unusual focusing or metering situations. I don't know about you, but I have enough things on my mind without adding something like this while reliable alternatives (circular polarizers) are so readily available.
By the way, adding to mattdm's comments, a total blackout is unlikely, but even various levels of reduced lighting (a so-called brownout) approaching either side of a total blackout might impact metering or make auto-focusing more difficult.
stewart
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