Originally posted by robgski Trying out DA lenses on the K-1, today I used the DA 55-300 in crop mode, pretty good results so far. I can't wait to see how the DA 21mm and the K-1 get along
Yes, they should all work perfectly well in crop mode. The pixel pitch of the K-1 is about the same as that of the K-5. The newer sensor performs considerably better at higher ISOs, though.
I happily use the 55-300 (the old DA SMC) in FF mode. Yes, the corners are weak even at its best (say 300mm, f/11, 20+m), and severely vignetted at less ideal settings. But even after cropping I'm left with way more usable image than APS-C. Of course, with this particular lens I'm rarely interested in what's close to the corners anyway.
The DA Ltds work variably well in FF mode. I find the DA70 to work well (with somewhat weak corners, but as long as I know that I'm fine with it). The DA15 can work well in 1:1 crop. Not sure I have tried the 21.
One more thing - a reason to use crop mode over cropping in post is if you need the higher frame rate. IIRC it's 4.4 fps in FF and 6.7 fps in crop mode.
Umm, yes, and I'm aware that I'm not much of a pixel peeper.