John P. Buck

So what is the difference between this lens, if any, to the SMC Pentax-M 28mm f2 lens. The mount is the same too isn't it?

Hi Andy, got the Yashica in the end, works like a charm. Thanks for the recommendation. 

Is this the ticket? 

http://www.amazon.co.uk/Contax-Yashica-Canon-mount-Adapter/dp/B0085WMU1C/ref=sr_1_4?ie=UTF8&qid=1395158807&sr=8-4&keywords=c%2Fy+adapter+7d

What would I need to get it working, a Yashica or a Contax adapter? Any modification I need to do for the lens?

Cool, thanks again Andy. Not had any luck finding one online but early days yet!

Thanks for the response Andy. So does anybody have a guide how to take apart the lens and remove the iris control lever or is it just better to snap it off as advised in the article?

Is it possible to use this lens on an APS-C sensor? What would I need to use as an adaptor, this? 

http://www.ebay.co.uk/itm/Mount-Adapter-Ring-For-Pentax-PK-K-Lens-to-Canon-EOS-600D-60D-5D-7D-1000D-DC129-/161252210150