Originally posted by Digitalis Certain focal lengths should be OK, there are many APS-C specific zoom lenses from pentax and third party manufacturers that are able to cover FF. For instance the Sigma 18-35mm f/1.8 can cover full format at focal lengths above 32mm* - I know, not much wiggle room there but it is possible...with a few caveats.
*Tested on Nikon D3s
Well, this is interesting, but you would be better off with a Sigma 35mm f1.4. Faster lens, smaller, and basically the same focal length. Nonetheless, I really hope that this DC lens will be available for Pentax.