Doremus, I’ve found something interesting in this regard. When I tested HP5+ sheet in HC-110B with step tablet in camera, measuring fb+fog at the rebate, the results agreed with your comment. Testing from 4min to 14min, the rebate showed fb+fog increasing from .16 to .22.Originally Posted by Doremus Scudder
Then I read an article by Howard Bond which I copied to a pdf file (attached) in which he said on p.4 (see my red font) that he measured fb+fog under a piece of electrical tape that had a small piece of aluminum foil under the tape to make sure the measured area under the tape received no exposure. So, later when I tested FP4+ in HC-110B, I followed his method for fb+fog. Testing from 5min to 9min, fb+fog was consistently .12 +/- .01. I’ve not yet redone the HP5+ tests. I suspect this is the rabbit hole you mentioned.
Reply With Quote
Bookmarks