Vintage Auto M42 3-pc Extension Tube Set by Asahi Optical Pentax

This is a nice 3-piece extension tube set for an M42 universal threaded camera and lens. It has the auto pin, which is useful if you use it on a vintage camera. The pin pushes in when the extension tube set is adapted to a digital camera. Though not marked, this distinctive, well-made, machined metal set was made by Asahi Optical Company for Pentax cameras. The set has light evidence of use. We tested it and it fits M42 well and snugly. Photos taken with an M42 55mm Asahi f1:1.8 adapted to Canon EOS DSLR.