Which polarisers would work well on wide-angle lenses without causing vignetting ? by wide-angle, i mean 90 and 110 in 5x7. these lenses both have a 67mm filter thread. i have alredy tried (a) thin version of the b&h filter (cuts a bit of the image circle) (b) no rmal b&h 82mm + 67->82 ring (worse), (c) cokin P + singh ray filter (that i like because they make a good warming tone polarizing filter, but vignetting comparable to (b)), (d) 77 filter that i modified by moving the retaining ring and glass forward so that the filter can rest directly on the barrel (no vignetting, but awkward, esp. if the lens is pointed down, i have to use tape or rubber to prevent it from slipping down). If possible, i prefer to use a warm tone polariser over a normal one.