Hello Igor, Wouldn't it partly depend on the design of the lens? Basically if the diameter of the housing (barrel) for the elements were much larger than the glass, then a thicker filter might be used? Seems like it would be more lens specific than just focal length to me.
-- Bruce Friday, August 17, 2007, 9:25:05 AM, you wrote: IR> Hello! IR> What is the widest angle of view for which there is no vignetting IR> with regular (non-slim) filters? IR> In particular, I am considering B+W MRC (72mm) CP. IR> Would the regular (non-slim) version cause vignetting with a lens at 18mm IR> on a digital SLR (1.5x crop)? IR> Thanks, IR> Igor -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net

