Quote Originally Posted by Randy Moe View Post
If we see the GG grain and the imposed image by any means are we not seeing usable focus?
Randy, of course, when we see in perfect focus the gg grain (by any means) then we see how sharp is the image. If the grain is not in perfect focus then we cannot be aware of how accurate is our focusing, but still we can get the points were are loosing focus (moving fordward and backward the camera focusing) and finding the middle point, if we do that at f/5.6 and later we stop to f/22 then sure we'll have the subject in focus, because the greater DOF will help.

Anyway the gg grain has lower resolving power that the film, so anyway we always have some room to find a middle point, IMHO.