Quote Originally Posted by Jeff Bannow View Post
I would like to run a test of my 4x5 sheet film development process, specifically looking for evenness from agitation. Here's my plan:
1. Find an evenly lit wall in the sunshine and meter for middle gray. Take a picture.
2. Develop.
3. Examine and look for any anomalies on the light table.
This seems so simple, that I must be missing something. Anyone have a preferred method?
Illumination of lenses tend to fall off near the edges and corners. Perhaps expose the film using the enlarger at f/16 instead? Or put the film on the counter and blink a light in the darkroom?
Also, the human visual system has a hard time seeing gradual changes in luminance. I suggest using a densitomer, or placing a light meter in various places on the film to measure densities.

Mark Overton