The question which really started off this whole thread came from the Slynkster: "What B&W film has the greatest exposure latitude?" Again, looking at the curves, I was very surprised. I expected to see the chromogenics, like XP2 and Portra perform a lot better than conventional single layer films. Indeed this was one of the Marketing stories when they first came out; you could shoot a single roll over very wide variations. Comparing the Ilford products, this is just not the case. XP2 starts to block about a half stop before Delta400, and almost a full stop before HP5. This was unexpected. With the Kodak emulsions, the Portra maybe can have a slightly greater range than T-MAX, at the expense of being overall less contrasty. It is VERY dangerous comparing curves from different manufacturers, (I tried to normalize as best I could). But if these curves are accurate, T-MAX has a wider dynamic range than any of the Ilford films, by about one-half to one stop. And this can be increased farther, without appreciably raising the fog, by increasing development times. Again, it is very hard to know if this is really a valid comparison, and I'm sure other characteristics are being traded off. But I'd be interested in hearing any practical experience indicating that T-MAX has such a nice exposure latitude. [I'm tired, and as yet have not found the curves for TRI-X.]