Zeiss Standard Speed MKII vignetting/portholing on ARRI Amira s35 sensor?

[Justin_Carlson]

Recently shot a project with a set of Standard Speeds on an ARRI Amira.

The focal length that gave me really bad vignetting was the 32mm. The 20mm, 28mm, and 40mm didn't give me any issues. The 32mm was originally a B mount that had a converter for PL mount. Its a temporary converter. My guess is that's the culprit.

Curious, has anyone here encountered this with that particular focal length? Or any issues using the original B mounts with converters?

I'm hoping that if I change the mount that this problem will go away, but my fear is that its the design of the rear element.

I remember renting a set a few months back and seeing a few focal lengths show a slight sign of vignetting. But this 32mm was horrible.