Amazon.com : K&F Concept Lens Mount Adapter Compatible for Leica M42 Screw Mount Lens to M4/3 M43 Micro Four Thirds Mount Camera with Matting Varnish : Electronics
Fotodiox Fotodiox M42-MFT-P-NDThrtl Vizelex ND Throttle Lens Mount Adapter- M42 Screw Mount SLR Lens to Micro Four Thirds Mount Mirrorless Camera Body with Built in Variable ND Filter at Lowes.com