Pentex makes an adaptor for 42mm to K mounts, but not all bodies, most of the auto foucs, will not meter and the shutter locks up. SF1 and SF1N will meter in manual and A mode and are inexpensive . Most manual focus k bodies work as well. Chinon's, also sold under GAF, CE 3 will provide aperture priorty metering and can be used with a motor winder. Spots with working meters are great cameras and will work your lens.