Hi rsolti13
Yes, I did Leitax conversion. I had CY28 f/2.8 being unused from my film days. With the conversion, it got second life and It is working very well. The only thing that did not work was that I got one with dandelion chip, but the chip was a bit too bulky and hit lens barrel, resulting not able to focus, so I removed the chip. It was not a big deal, but was a bit disappointed. Now with NEX + Nikon adapter, focusing is quite easy and it is getting used even more.
Akul