Quote Originally Posted by ic-racer View Post
If you try to judge exposure based on black, white or some other gray, you are not using the filter set properly as designed. I'd ignore criticism of a product what was used incorrectly.
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.