I've been trying to find a Lee .9 Hard stop GND since November. Really, November of '09. Adorama, b&h, amazon were all out. I finally found one on amazon through a third party in the beginning ...
My question stems from the fact that the surface of the filter is completely out of focus. My understanding is that light from any one point of the subject hits the lens all over... some of it ...
HDR and multiple exposure blending seems very popular these days. I wonder, what did film photographers do to solve dynamic range issues? For example, I know GND filters were common (and still are), ...