Oh, I agree with the "not quite". I will point out that the study of diffraction and the way the wave propagation affects the light ray paths is complex and would require a "course of study" FAR beyond the scope of concise messages here. That is why I tried to cover my gluteous maximus by using the "pseudo" before the "focus". The "pseudo" does not appear to have been very successful.Originally Posted by Ole
BTW .. "diffraction kills sharpness" - is true - but without it, "pinhole" would not work at all.