M42 and K-bayonet have the same register, and very similar to Nikon
bayonet. That's why there are no adapters I know of that will allow
infinity focus.


There used to be a K-to-M42 adapter that did allow infinity focus. It
contained one or more optical elements to make this work.  ...


It's generally a bad idea, though. The M42 mount is smaller diameter as well as the same register which makes it hard to make this without also putting a low-power teleconverter in such a mount. That's what Canon did for the FD->EOS converter ... and IMO it was a total waste of time.

Probably.

Makes me wonder, though; would it be possible to add some kind of correction lens that didn't actually magnify?


I've also wondered if the lens mount casting from a K1000 would bolt
onto a Spotmatic.

It's been suggested on this list and other places that the K1000 actually *was* a Spotmatic with replacement mount screwed onto it...

Those cameras were similar enough that it just might
be the case. You'd be limited to stop-down metering, but you'd have an
interesting conversation piece.


Yup. Like the guy who adapted the Leica R bayonet mount to his Nikon F2 body. Hated the Leica R bodies, loved their lenses, and didn't care about Nikkor lenses...

He, he. Maybe I'll use the Nikon bayonet ring to make a Pentax F just for a laugh... Although I think the opposite would make more sense in some ways...

- T


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