Leitz Summicron 5cm f2 lens mount_M42 These fit over the narrow

These fit over the narrow control knobs on early model Calypso and Nikonos lenses for a larger gripping surface

it's a pretty cool machine to shoot with (and the results are pretty great)

I'm assuming that this was the absolute cheapest lens that it was possible to make

Walz Bay 1 #301 (yellow) filter for the Bay 1 bayonet filer mount

Is it Biaumas

Leitz Summicron 5cm f2 lens mount_M42 These fit over the narrowLeitz Summicron 5cm f2 lens for Leica M mount in very good condition overall, with minor cosmetic wear on barrel, smooth focusing. Glass shows minor dust, a few small (< 1mm) spots of coating wear on the front element which will not affect function. This lens has just come back from a professional CLA.