Raid- those are great. Now I know why someone went through the trouble of making this old lens into a Leica mount, then "used it to death". The combination of the newer front module and older rear came out great, better than either of the originals. The Bokeh is very smooth on this lens, and it is a "Lost Optical Formula" from everything that i have read. It is a Xenon computation unique the the pre-war Retina II.