Can you identify this lens mount

[TerryMcC]

I picked a lovely condition Sigma f8 600mm mirror lens for next to nothing and took a chance on the mount. It is neither a Nikon F nor Canon FD (pre autofocus) lens mount. The inner diameter (chrome edge to edge) is approximately 39mm. Can anyone tell from the pictures what it might be?

 

[Toyo]

Looks like Olympus OM mount to me - could be wrong though
Tom

 

[BMbikerider]

Going by the red marks on the back of the lens, it may well be a Minolta. The measurements you give are pretty well closest the Minolta lenses I have.

 

[Toyo]

Going by the red marks on the back of the lens, it may well be a Minolta. The measurements you give are pretty well closest the Minolta lenses I have.

It is similar, but Minolta usually have a notch in one of the bayonet lugs to lock the lens and I can't see one here.
T

 

[cooltouch]

Looks like Olympus OM mount to me - could be wrong though
Tom

Yes, it's Oly. See the two squeeze tabs (located at 10 and 4 o'clock in the top photo) that are used to mount/unmount Oly lenses? That's the dead giveaway. The Sigma 600/8 mirror can be a great optic. I bought a copy back in 1984 in Canon FD mount and it was an exceptionally sharp lens.

 

[TerryMcC]

Thank everyone, your help is appreciated. I don't have any Olympus gear, so this seems like a great excuse to get an OM4Ti.

 

[GRHazelton]

Do know that the OM4s, at least many of them, have an unpleasant habit of discharging their metering cells rapidly. Other Oly owners may be able to comment more fully.

 

[TerryMcC]

Interesting. I must do some searching on this

 

[TerryMcC]

I had a choice: sell the lens or get a camera for it. Bought a OM-10 for $110, looks in good condition and has a return if unhappy guarantee. Looking forward to the first roll ever with a mirror lens.
Edit: PS the lens was $68