Carl Zeiss Prokinar 105/1,9

first 3 pictures were shot with NEX5

Below was shot with NEX5+Zhong Yi Lens turbo 1rst version. I can say it has same sharpness at center, but less in edge

Carl Zeiss Jena Visionar 84/1,6

Tested on NEX5 in front yard.
need modification to get infinity on my set up.