Sigma 30mm f1.4 strange circle appearing

Started Jan 7, 2019 | Discussions thread
Rahto Senior Member • Posts: 1,564
Re: Sigma 30mm f1.4 strange circle appearing

First I think the Sigma 30mm 1.4 is a crop lens like a Canon EFS lens so it’s not going to work well on a full frame camera. The second thing I would do is attach it to the Sigma dock and see if it has the latest firmware. If you don’t have a dock I would recommend getting one but I’m sure a local Sigma dealer could check it for you. 3rd as already mentioned turn off any lens corrections in the camera. I have this lens in Pentax mount and it shoots well on a crop body but not my full frame Pentax. There is no EXIF data on the example picture to see what body was used but if it was the 5D it could be just a crop lens on a full frame camera and the camera trying to fix it. Sigma’s crop lens designation is DC and their full frame lenses are DG. I hope you get it sorted


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