lens mount id please

Not a Pentax K mount nor an Olympus OM mount. Not a Praktica bayonet mount nor old style Fuji X mount. Beyond that I cannot help.

What does the lens bezel say?

Edit: I have changed my mind. That looks very like a Pentax K mount with the aperture set to ƒ/3.5. There are many variants of these as Pentax tried various autofocus and electronic aperture control which means that the electronic contacts can be in a variety of places.
 
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Thanks John.
100-300mm 4.5-6.7 DL - made in Japan - 55 sigma zoom
It has no other identifier.
 
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Bassit said:
The lens cap says SA/KPR but i have searched google but cant find this particular mount.

by John Garton, on Flickr
Click to expand...

That's because it's multiple mounts. Caps that fit Sigma's SA mount also fit Pentax K & Ricoh K...
SA mount is not interchangeable with the others having a shorter registration & different electrical protocols.
 
Bassit said:
Thanks Toni, it appears to be a Pentax "Kaf" mount looking at your second link.
Click to expand...

I thought so too - found the first link & posted it because although the dscussion subject was different, those mounts looked the same. Carried on looking afterward & found the second link, where they have a picture on a mount that looks virtually identical.
 
Thanks for the replys guys..(y)

I was aware that the cap was compatible with both mounts, i maybe should of been a bit clearer there.

I had searched for quite a while and read a fair few pages on pentax forums, but there are 2 differences between this mount and most of the pics i could find, theres the sideways flat contact and there is no ricoh pin on this so i couldnt be sure...ancient_mariners search skills must be better than mine.
 
Just lucky I guess (searched for Ricoh lens mount in images)
 
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