Roger Hicks
Veteran
Photography is funny. It's amazing how, for such an intrinsically subjective study, we all try to define it so precisely. 🙂
Anyways, I would agree that Delta can appear more grainy; it does have a lumpy grain pattern at least, whereas TMZ has a more fine grain pattern, even if those grains may be spaced out pretty well 😉
Having worked in camera repair, and having little faith in accuracy of metering and the consistency of shutters and emulsion, I'm not super precise with speed numbers. I just say Delta and TMZ are about, around, close to EI ~800-1000 ish. I do know that for really big pushes Delta starts to fall apart. One of my favorite images I've ever made was with TMZ at 12,500 in TMAX developer (to be fair it required a little mercuric too...). I don't personally like Delta above 1600.
Perceptions of sharpness is notorious too, right? I'm of the "sharpness" is more perceived crispness of medium sized details in an image. I would not be surprised if with some developers Delta may have more actual detail though...
Not to inflict another developer on you, but if you like Delta 3200 I can highly recommend replenished XTOL with it.
Cheers
Oh, sure. The speeds I'd disagree about, because although I can't do true ISO testing, I know people who can, and I can also do comparative speed tests (same camera & lens, plot D/log E curve) reasonably well, and Kodak, Ilford, the late Geoffrey Crawley and I all agreed that Delta 3200 is 1/3 stop faster.
Thanks for the suggestion of replenished Xtol, but I prefer single-shot for a higher true speed (no hydrobromic acid build-up) and besides, as you suggest, adding another developer can be more trouble than it is worth.
Cheers,
R.