see lens flare here
Vignetting at 200mm? Not sure how likely that is. Try taking 2 shots of the same thing with and without filter, then see if there is a problem.
Canon EOS 5D, 24-70 f/4 L IS, 50 f/1.2 L, 70-300 f/4-5.6 L IS, 600EX-RT. Sigma 12-24 f/4.5-5.6 EX.
looks like lens flare rather than vignetting because the cranes are still very visible at the corners
Looks like an interference pattern to me.
Real freaky man, a white ring around the helicopters. Did you take a photo through a glass window?
Try to shoot using different aperture, or try tho remove the filter...
Achetez ce que vous souhaitez, pas ce que vous voulez...
See section under vignetting @ 18-200mm
This is exactly what I have been experiencing although peripheral illumination correction has been enabled.
Any advise from experts out there?
Thanks in advance.