albertri
Senior Member
Well, that's for film cameras,and can go lower though I've never seen or heard anyone using that, the lowest I've seen on any DSLR is ISO 50 from Canon as far as I've seen/heard/know. Even if can go f32 or 35, might only be useful for macro I guess, not really sure of the uses, but anyway, beyond a certain aperture, differs for each lens, diffraction sets in, there's an optimum sharpness for every lens range, after that, it becomes soft
All Oly 4/3 lenses are f22... was this due to 4/3 sensor or buy design???