Advice on how to use Pentax smc-m 20mm f4 lens with a canon 550d slr

[mrizzle]

Help!! I am wondering if anyone can offer advice or has previous experience with using a Pentax smc-m 20mm f4 lens with a canon 550d slr! I have received mixed information and am now thoroughly confused! I was directed to this website. However, I wonder if it's truly necessary to have the lens 'operated' on to make it compatible with the canon 550d?!

http://www.jcolwell.ca/photography/c...os-adapter.pdf

Any advice would be massively appreciated!! Thanks folks!!