Quote Originally Posted by Bill Burk View Post
I was going to say that is awful - makes using an enlarger for sensitometer look like a bad idea.

Until I realized. I keep the enlarger locked at the height to make an 11x14 print from 4x5 neg. So I am only using the sweet spot near the middle.

I placed the film squarely under the lens, but positioned the test strip on the left-hand side - so maybe I fortunately avoided the hot-spot at dead center.

And I am using a grid light source, not condenser.

What is your light source (does the lens really have a hot spot in the middle or do condensers play into it)?
The example shown is a cold cathode source originally used for graphic arts printing. I subsequently modified it somewhat for continuous tone printing, though, I keep it only as a spare. One modification was to use that piece of film shown (exposed under the enlarger) as a center filter above the negative to even out the light. Other modifications involved mounting the cold cathode closer to the negative and enlarging the orifice of the mounting plate.