09-19-2010, 08:18 PM
"Additionally I have a UV filter and a polarizer attached"
There is your problem! At 17mm using a single filter will be ok but doubling them up will cause heavy vignetting. Why do you have 2 filters on? Is it because you have the UV permanently bolted on through fear of dust on the 17-55? If not, then I cant imagine why one would ever mount a UV filter on a DSLR. (My guess is that this vignetting would probably disappear by about 25-30mm if you did have 2 filter on...)
Allan
There is your problem! At 17mm using a single filter will be ok but doubling them up will cause heavy vignetting. Why do you have 2 filters on? Is it because you have the UV permanently bolted on through fear of dust on the 17-55? If not, then I cant imagine why one would ever mount a UV filter on a DSLR. (My guess is that this vignetting would probably disappear by about 25-30mm if you did have 2 filter on...)
Allan