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 ...
I think I understand Graduated Neutral Density Filters, however, what are the purpose and how do you use Graduated Color Filters? (IE Red, Yellow, Blue, etc) And Are they worth it?
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 ...