AF problems using polarizing filters.

Started 8 months ago | Discussions thread
M Stewart Contributing Member • Posts: 647
Re: AF problems using polarizing filters.

Mark B. wrote:

I've never had a problem with any circular polarizers. I wonder if it is marked incorrectly and is actually a linear polarizer; in which case AF will not work properly on a DSLR.

That's easy enough to check.

Hold the filter between your eye and a non-metallic reflecting surface.  Whilst viewing the reflections, rotate the filter and see if the intensity varies.  Turn the filter so that you're now viewing light the other way, and repeat.  A linear polarising filter will give a similar performance both ways round.  A circular polarising filter will have no effect viewed one way, and in the other will vary the reflections as its rotated.  (In all cases, there is a drop in intensity due to light loss.)

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M. Stewart
Milton Keynes, UK

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