Fotodiox with Sigma problems

[pfogle]

Hi, I'm trying to use a Sigma macro on my A7R, with the EF Fotodiox Pro adapter. I need the through contacts for aperture, even though the AF doesn't work well.

 

I'm finding that I have a contact issue and I can't trace it. My other EF lenses work fine (again, AF is dodgy at best), but it happens with both my Sigma macros.

 

It will fire maybe two or up to ten times without problem, then will just lock up and do a time exposure, but with nothing recorded and it will reset all menu settings to the values before I put the adapter on.

 

I can get it to reset by removing the lens and replacing it, but that's a hassle.

 

The camera is on a tripod, and nothing is changing between exposures, focus is locked off, it just seems random.

 

Question: is this known behaviour? Is there a solution? From the reviews I've read, it seems Fotodiox is pretty well the same as the Metabones, so I'm unwilling to spend a load of dosh on a new one.

 

Any help gratefully received!

 

thanks

Phil