Lens Adapter - M39/L39 Screw Mount Lenses to Pentax Q Mount Cameras – Fotodiox, Inc. USA
Almost All lensmounts ever made - Vintagelens
M39 Mount Lens List
Amazon.com : Fotodiox Lens Mount Adapter Compatible with M39/L39 Screw Mount SLR Lens to Canon EOS (EF, EF-S) Mount D/SLR Camera Body - with Gen10 Focus Confirmation Chip : Electronics
Leica 5cm (50mm) f/2 Summicron Wetzlar Collapsible M39 Screw Mount Lens, Chrome {E39} SOOIC at KEH Camera