Originally posted by BigMackCam but if the same lens fitted to a K-1 and K-5, it should resolve in much the same way, as their sensors have very similar pixel density...
No
I covered it here
Dumb lens question - PentaxForums.com in #12
Well at least I haven't been debunked yet
It is all about visualising the image circle.
EDIT and from post 34 of that thread
" First of all both resolution of the lens and the megapickles of the camera both contribute to the final image so there is not a black and white answer here.
A good lens is expected to achieve 100 lines per millimetre.
Lets turn that into points of detail 1/100mm square. And yeah I know - a questionable conversion - i think the reality wouldn't be that good.
That converts into a apsc rectangle on the image circle at 3.5 megadots.
So with the K3 that is 3.5 megadots converted to digital with 24megapixels
On the K-1 sensor that would be 5.25 megadots converted with 36 megapixels.
So still a no-brainer."