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Dad Photographer
Robin (at Panera Bread Bakery)
I love the way it renders on the M9. I am currently using mine on the Sony A7 with an AF adapter, and it is at least as sharp as the latest 50mm Summicron pre-asph, if not even more.
I'm a bit confused: Are you using a modified to M-mount Contax G lens? Or are you using a 'native' lens that can be auto-focused on the A7? The mention of the AF adapter is what caught my eye here. If indeed you're using a lens that can be auto-focused on the A7, what is the brand of the adapter? Thanks.
It's invented by a Chinese guy: Mr. Liang and you can find the adapter here:
http://www.ebay.com/itm/NEW-DEO-TEC...ens_Adapters_Mounts_Tubes&hash=item27dd4d3aaa
You can adapt all Contax G lenses to SONY NEX/A bodies with auto-focus function.
I have tried the adapter on my SONY NEX7 body with the previous version and at that time the focus was bit slow and sometime causes the camera shut down.
Somebody said the updated version 2 is much better but you can't use 21mm and 28mm Biogon because of the big intrusion of the rear element and the color shift.