I can't speak about the Contax since I've never shot one. I do shoot a iiia regularly with a Summar and it's fine. You will probably need an auxiliary finder, either the Leica one or the one sold by Voightlander. With zone focus, the auxiliary finder truly makes it a point and shoot. You will also need a lens hood. The adjustable one works as well as the big Summar-specific hood. No matter what you buy, you are at the top of a very slippery GAS slope.
Last edited by presspass : 12-06-2018 at 06:15.
Reason: Additional information