Petri Kuribayashi cc 50/2 & Lens turbo

The lens was in Petri bayonet, then modified to M42.
I use it on my Sony Nex 5 and Zong Yi lens turbo 1rst gen.
No degradation in term of sharpnes at center with this combo.

Petri Orikkor Kuribayashi AC 4,5cm/1,9

This one is from Petri range finder camera

I like this lens. sharpness, bokeh, 3D, colour, contrast...what else..?

cropped to see more detail