Quote Originally Posted by Tom Kershaw View Post

I presume one can make best use of the Stouffer transmission projection step wedges in conjunction with a densitometer in order to access paper and process characteristics.

Yes, Tom

But you can make a lot of use of them without a densitometer too. I can tell you, fr example, what ISO grade your filter/material combination produces with a step tablet and without a densitometer. No sweat!