I have a 35mm Art 1.4. On my Canon Rebel T3i I get perfect pictures at 1.4, and on my Canon 90D ( also a crop sensor) I get blade interference at 1.4 - Why? What am I missing here?
I think it's a firmware issue. Sigma has replied that they have an update to fix this known issue.It is vignetting - oddly it shows up in the preview, but not the CR3 or DNG on Lightroom. Thank you for participating and trying to help.
