Clearing the Confusion: Leica 50mm Summicron Version History – The Thoughts & Photography of Johnny Martyr,LEICA SUMMICRON 50mm Guide,Leica Summicron-M 50mm f/2 Rigid 11018,Leica M-P Typ240 + Leica Summicron-M 50mm f2 2nd – Doppietta-Tokyo,Leica 50mm APO-Summicron-M ASPH f/2.0 review, sampel photos and interview with the lens designer Peter Karbe - Thorsten Overgaard's Leica Photography Pages