Skyllaney. It is the reference lens used for its upcoming Sonnar that was fully converted to M Mount and 6-bit coded. After a bit of back and forth, arrived at a fair price.A great portrait with a fine old lens. Who converted it to M-mount? I have a couple Contax mount CZJ lenses converted to LTM by Sonnar Brian; they are a joy to use.

With a deep yellow or orange filter, the Sonnar sharpens up considerably as chromatic aberration is reduced.
My 1934 5cm F2 CZJ Sonnar, converted to LTM. This one is uncoated, but has a beautiful bloom and very clean glass. I also have a 1940 5cm F2 coated, converted to LTM.
I will be testing those against the Skyllaney Bertele Sonnar due to arrive to me towards the end of the Summer.
Chris at Skyllaney does amazing work.
I know it might be blasphemy, but Brian, do you think it would be possible to convert a Sonnar to LTM using a Hexar 50/3,5 collapsible barrel? I have one with some cleaning marks that might be a good candidate.
Listening by Steve Macfarlane, on Flickr
Ceci n'est pas une voiture... by Steve Macfarlane, on Flickr