There are some adapters on the auction site now that work pretty well. Can be had for various mounts of camera. I got one for Sony Alpha (NEX) and am pleased with it.
Kiev/Contax to NEX adapter
by Carlos Yashinon
, on Flickr
RF's : Bessa-R ,FED II, Olympus 35RC , Kiev 4AM,Argus C-3
Other :Minolta XD-11, Minolta SRT102, Pentax Spotmatic ,Nikon N80, Yashica-Mat 124G, Rolleicord Va
Digital :Nikon D7100, Sony NEX 6, Panasonic LX-5