Hi,
I'm new to this forum, but saw there were a few posts from A7S owners and users on here, so thought somebody may be able to help with the predicament I find myself in.
I recently bought a Sony A7S, with metabones EF-E adaptor (Mark IV) and Sigma Art 24-105 lens. I'm having a lot of trouble getting the lens and camera to connect properly - Sometimes, the lens works fine and I can shoot long video clips no problem.
However, a large proportion of the time, the set-up has several issues:
1. The aperture randomly jumps 1/2-1 stop either side of my current exposure.
2. The iris
