Originally posted by emalvick Perhaps my lens is flawed some-how
Not likely. Some lenses do vignette with filters. The Tamron 17-50 is a great bargain so you can't expect it to excel at everything.
Originally posted by emalvick my primary question was really just whether people see this type of problem (vignetting) with their ultra-wide-angled lens and filters.
I didn't have any problems with the DA 12-24 provided I used thin filters. The DA 16-45 doesn't seem to have a problem even with thicker filters. The first version of 18-55 did, however, suffer from this issue.
Originally posted by demp10 All lenses have some degree of vignetting
That's light falloff rather than the black shadows the OP is writing about, which are cast by the edge of the filter.