A7s Stills focus DoF problem HELP!

Hi Guys. I mainly do videography but have recently started doing a bit of photography on my a7s. I've noticed that while mounting Canon chipped lenses on my a7s with my fotga and metabones adapters the viewfinder and lcd on the camera doesn't show the depth of field change as I stop down. It gets darker, but it doesn't tell me what my depth of field is, it always seems to act as if the lens is wide open. So when I take the shot, the photo that comes out is nothing like what I was looking at through the viewfinder. Is this a common problem or is there a setting that I've set incorrectly? This has never been a problem in movie mode so I've never noticed.

Please help!
 
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