The DA15/4 Limited is unable to be used sensibly on a Canon EF mount. The Pentax K->EOS adaptation is difficult enough due to the layout of flanges, potential interference from mechanical bits and such, and the DA lenses have no aperture ring. So the lens would always be at f/22 unless you found a way to jam the iris actuator to a useful position before fitting the lens to the mount.
I would recommend against it. On Thu, Mar 25, 2010 at 10:23 PM, Hershel Baltrotsky <[email protected]> wrote: > I want to get the Pentax Ultra Wide Angle smc-DA 15mm f/4 and use it on my > Canon Rebel t2i. > I have been looking at a bunch of different adaptors from eBay and just > wanted to see if there was a certain one that works better (if they will > work at all)? > Also, if the adaptors with the chip for focus and aperture priority actually > work? > > Has anyone tried this lens on a Canon? > Thanks for your help! > > Hersh > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- Godfrey godfreydigiorgi.posterous.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.

