>-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Hans >Korremans >I am suffering vignetting in four corners of the image with the following >combination: EOS3, EF 20mm f2.8 USM and B+W 72 Circular polarization filter >F-Pro. Removing the (original) lens hood doesn't help and the filter is >visually clean (holding the filter againts the light) besides some minor / >transparent and cristal like contamination when I look through the viewer, >most critically. So little that I cannot imagine this is the root cause.
Could be that the filter thread is getting slightly into the FOV. The EOS 3 does not have a 100% viewfinder (though close to) which can make a bit a difference in particular if you shoot slides. Also a 20mm lens has quite a big FOV so the polarizer will have a different effect in the middle of the FOV and at the border of the FOV. Since the corners are quite a bit futher away from the center then the middle of the four sides the brighness will not be even along the four sides. Robert * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
