pentax mount for EOS body? help asap!

[engrmariano]

hi all, how to connect Sigma 600f8 mirror lens Pentax mount to my EOS400D?

[ericvision]

It is common for those lenses to have a T-mount. If that is the case you can unscrew the mount and fit a Canon T-mount which will be easily available in a camera shop.

Otherwise you'll need an adaptor. The usual complaints about adaptors don't count in this case, since the mirror is non-AF and fixed aperture anyways. You should be able to get one on ebay pretty easy.
For Pentax K:
http://cgi.ebay.co.uk/Pentax-PK-Lens-to ... dZViewItem
For M42
http://cgi.ebay.co.uk/Pentax-M42-Lens-t ... dZViewItem

You should be able to find them in whatever ebay country you're in. Good luck