I had completely forgotten about this little gem in his book. In fact I had to get it of the shelf just to be sure it was there. I apologize for having any doubts.
Originally Posted by Uhner
It would appear that DD/FF is the trad B&W film's answer to Ilford's chromogenic XP2+ where the film can be exposed at anything between EI 50 and EI 800 and still have usable negs with a common dev time.
It seems so incredible that I'd have like to have seen Les' prints from just such an experiment. Even if the neg isn't perfect, it would be worth a try if you could only get the "never to be repeated shot of a lifetime" at EI 1600 but didn't want to sacrifice the rest of the roll. all of which were shot at EI 400.
Les only mentions Tri-X. I wonder if the process is equally successful with HP5+ which is a similar trad film and finally what about the newer films like D400?