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.
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.
