Subject: RE: EOS Vignetting with EF 20mm f2.8 USM and B+W 72 Circular polarization filter F-Pro
-------------------------------------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. > > Hans ---------Reply From: "Robert Meier" <[EMAIL PROTECTED]>------------ > 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 ----------"Hans Korremans" <[EMAIL PROTECTED]> wrote------------- Thanks Robert for the swift reply. I considered the same as it seems the most logical explanation. I therefor wonder what other EF 20mm f2.8 USM and 72 mm Circular polarization filters are known to be working fine and whether other EOS users have experienced similar phenomena as mine. The listed filter / lens combination should be in use elswewhere, not? Please all; share your experiences and tell me what alternative Polar filter brand to buy instead. Thanks in advance, Hans * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
