I have been in touch with the seller, and he has since admitted to it being an Olympus OM mount. He has also agreed to a full refund and even the return postage costs, what a nice fella! So congratulations to anyone who guessed correctly, and thanks to all of you for the help/advice.

Cheers

Johnny

I have a link to some photos of the lens:

link

Hope these help.

Cheers,

Johnny

Hi - I'm fairly new to dslr ownership, so excuse any daft questions!

I recently purchased a Sigma 28-70mm f3.5/4.5 from ebay, advertised as a PK mount lens. However I tried fitting it to my K-x and I can't get it to lock into place. I was fairly sure that all K-mount lenses should work with a k-x body. I have no other 'old' lenses to compare it with, only the 18-55mm and 50-200mm kit lenses (which work perfectly as expected). I've had a look online but can't find any helpful info, so if anyone can help me out it'd be greatly appreciated.

Cheers