Dear Joseph, if I was in this situation, I'd simply put my camera on a tripod and take exactly the same shots with and without the filter. If the vignetting decreases without filter, it is the culprit. I don't think that coating (or the lack thereof) would be responsible, rather it may be that the filter is simply too thick and you are actually taking pictures of its edges... I'm already using an ultra thin polarizer on my Sigma 21-35 because I had some additional vignetting with the normal polarizer. Laurenz http://www.travelphoto.net/ 2005/11/15, Joseph Chamberlain, DDS <drjchamberlain@xxxxxxxxxxxxx>: > Dear list members: > > I have a question for the group and would appreciate any feedback I could > receive. > ... > My impression is that this is being cause (at least in part) by the filter I > am using. When I purchase my camera I asked for Heliopan multicoated UV > filters for both lenses. The reseller gave me by mistake the single coated > filters and I didn't notice this until I got home. When I hold the > multicoated filter I have on my Nikkor 17-35mm and the single coated filter > I have on my Canon 16-35mm both against the light in a angle it is easy to > see that the single coated reflects a lot more light than the multicoated. > Could this associated with the curvature of the lens and the light fall out > effect that has been discussed here in the past for full frame sensors cause > this problem ? What are your opinions ? >... > Dr. Joseph Chamberlain > Oral and Maxillofacial Surgery > >
