K-mount Rikenon Lens on m42 Pentax body?

Hello! I'm a rather young photographer looking for adapters for lenses. I had an old Ricoh XR-P with a Rikenon lens (1:4 28~100mm Macro 670 ) which the camera itself had broken. I really enjoyed the Rikenon lens and would like to use it on my Pentax SP 1000 I recently bought. The problem however, Is that the Rikenon is a K-mount and the SP1000 is a m42 mount. I looked for an adapter that is appropriate but only found the opposite, An adapter for K-mount bodies to use a m42 screw mount lens. Does anyone have any suggested adapter and links to them? Any help is greatly appreciated! -Ryan

I have never heard or seen of a K to M42 adapter.

Yeetthemeat said:

Hello! I'm a rather young photographer looking for adapters for lenses. I had an old Ricoh XR-P with a Rikenon lens (1:4 28~100mm Macro 670 ) which the camera itself had broken. I really enjoyed the Rikenon lens and would like to use it on my Pentax SP 1000 I recently bought. The problem however, Is that the Rikenon is a K-mount and the SP1000 is a m42 mount. I looked for an adapter that is appropriate but only found the opposite, An adapter for K-mount bodies to use a m42 screw mount lens. Does anyone have any suggested adapter and links to them? Any help is greatly appreciated! -Ryan

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Afaik it doesn't exist. The K mount is larger in diameter than m42, so any adapter would miss infinity by quite a bit.
However, there are many excellent m42 lenses out there for very little money - Takumars, the SMC 55s for instance, are top notch and cheap.

I've just tried a few companies who I thought could help but there is not an adapter listed that you require. Loads for the other way around though.

The main company that I checked is the following link, who also make bespoke items but if it's at all possible it probably won't be cheap as a one off request. You could ask though.

https://www.srb-photographic.co.uk/lens-adaptors-e6a78nproducts1167curpage-2-1167-c.asp

And this link is an interesting read, explaining the ins and outs and one persons work around, that might be useful.

https://www.pentaxforums.com/forums...e-converted-k-mount-lens-m42-screw-mount.html

Bottom line though I think, is to buy a cheap camera that will take the lens you like and / or buy a / some cheap k mount lenses to fit your k mount camera body.

Terry S