Loose extrapolation from the Kodak website: 70F, 17min in fresh undiluted developer. (I found that Tmax 400 at 1600, in Xtol 1:2, 68F, 25-30min produces a decent negative).(posted 9102 days ago)I have found that IR films just don't push well at all. Of course, I only have used them for the IR spectrum, not for their orthocromatic properties. However, Kodak HIE is a grainy film. I'm not sure if HIE or TMZ (Tmax P3200) is grainier. Try TMZ at 25000, and let us know. :-)