Thanks for your response.

This is not Canon FD, doesn't look like it either. It doesn't has anything stamped on. I also know the Tamron adaptall but this is not that, too

Thanks anyway.

I upload another photo with the mount hoping it to be named.

Hello there,

Recently I bought a Sigma Micromacro YS 100mm f/2.8 lens thinking that is is in Pentax PK mount. Unfortunately in turns out that the mount is not PK though it looks a bit similar. I post some photos of the lens and the mount here hoping someone would be able to let me know what mount is it. Thank you.




[IMG]http://i42.photobucket.com/albums/e343/elektriman/Sigma100f28Unkown/IMGP6795.jpg[/IMG]