Posted by Mark Windom on January 11, 2007 at 12:50 PM
Coming from a past of manual everything cameras I have an assortment of linear polarizers. Everything I've read, including the manual that came with my digital camera (D2Xs), has stated that circular polarizers are required with digital SLR's. However, in testing my camera with a linear polarizer both autofocus and autoexposure are working fine. Not that I'm complaining (just saved a few bucks) but I'm wondering why I don't have to toss my linear polarizers??
It's actually not a digital issue but an AF issue. You won't see it all the time, but under some conditions the AF sensors can get fooled by linear polarizers and fail to achieve accurate focus. This is true for any AF camera, not just digital.
Guy
Posted by Don Miller on January 11, 2007 at 1:26 PM
Does AF work when the focus point is in an area that the polarizer is effective?
Edit: I see guy got to it first.
Posted by Kent Staubus on January 11, 2007 at 10:07 PM
Guy--
It seems to be more than that. When I tried to use a linear on my Nikon F100, the exposure was usually (though not always) screwed up. Generally, it was about 2 stops too dark.
Discussion
3 repliesGuy
Edit: I see guy got to it first.
It seems to be more than that. When I tried to use a linear on my Nikon F100, the exposure was usually (though not always) screwed up. Generally, it was about 2 stops too dark.
Kent in SD