Fotodiox FD-PK-Pro Pro Lens Mount Adapter - Canon FD & FL 35 mm SLR Lens To Pentax K Mount SLR Camera Body with Built in Aperture Control Dial - Walmart.com
135mm legacy Shoot out: SMC Pentax-M f/3.5 vs Canon nFD f/3.5 vs. Panagor f/2.8 - phillipreeve.net