Quote Originally Posted by RalphLambrecht View Post
What's your question?

Well, before you ask, there is no reason to use film pre-exposure in combination with variable-contrast papers, but when using fixed-grade papers, it's a valuable technique to add shadow detail to the negative.

I use a self-made diffusion filter to make a Zone II or III pre-exposure.
Not True! There is a place for pre-exposure no matter what material you are printing on.
Example: In a forest with the sun streaming in through the trees from in front. The side of the trees facing you would be in deep shade. If you expose for the trees on Zone III, the highlight areas will be burnt out beyond printing capabilities.
Pre-expose the film on ZOne II then make exposure as indicated for the overall scene. The bark of the trees will now be dark with detail and the highlights will not be blown out.