Adapters to use lenses on mirrorless cameras have given many orphaned lenses new life in the Digital age. This can range from picking up an adapter off of Ebay, to dremeling a fixed-lens RF. This one was not that hard, a Konica AR mount 50/1.7 adapted to Leica M-Mount. The adapter, Konica to Leica bought off of Ebay for $40. Most Japanese 50mm SLR lenses are actualy closer to 51.5mm, the Konica is no exception. To RF couple it- just had to make a Cam that attached to the retaining ring for the rear element. Got it finished today, as the Sun was going down. The lens is RF coupled to 0.65m, and focuses properly to infinity. Wideopen at F1.7. The Konica 50/1.7 is one of the best SLR "normal lenses" of the 1970s. the "CAM" is made from a retaining ring from a Russian I-61 for extension, spacer ring from a Jupiter-8, and copper-tape used for "fine-tuning" the RF calibration.