Quote Originally Posted by Bill Burk View Post
It works as designed, but I think Ralph is levelling his criticism at the design.

The calibration technique from Paul Butzi in the original post describes calibrating to have consistent exposure for the highlights, which I think is what Ralph wishes the filter manufacturer had done.

So if you have a Dichroic head, you have a choice of approaches.

p.s. I use graded paper, so maybe I don't know what I'm talking about.
i could not have said it better myself.