Originally posted by garyk I have the 300mm f2.8 lens from sigma. It is af lens. But several times i have tried to manual focus thru trees and such. I cannot ger a sharp pic with the k-7. I cannot get a proper adj on the eyepiece. Now the k-20 is different. It is easy for me to use because it lets me adj. the viewfinder sharper.
Is the diopter control on your K-7 defective, perhaps? It should be possible to adjust it just as the K20D. Manual focus on the K-7 shouldn't be any more difficult than the K20D. The viewfinder is only the tiniest bit smaller (but gives 100% coverage, which is a nice plus).