1dx2 with Sigma 35 Art - Rings showing up in image

[adventure]

Hi all. Has anyone ever seen this? Shooting on a new 1DX2 with my Sigma 35 f1.4 Art. Weird one, have had the lens for a year or more without ever seeing it on a 1DX or 5D3 or 5DS. Only shows up when using an open aperture, maybe anywhere north of f2.5 or so, but it's not consistent. Shows up in live view, on the playback, and on the image forwarded to the iPad. Attaching camera shots of each.

It almost looks electrical, but the edges of the rings aren't perfectly sharp. And it doesn't change with the aperture - same shading, size, shape, etc. It's either there or completely gone. I'm stumped.

 

[d]

There is another thread detailing this. Turn off peripheral illumination correction in the camera's options to fix the problem. Only an issue with some copies of third party lenses.

d.

 

[Besisika]

As per above, turn off PIC and you will be good. I had it on the same model and now all perfect. Enjoy

 

[TeT]

cool effect if you could find a use for it...