Ah, NUTS!! Kodak is dropping HIE in 4x5, and I just bought two multi- exposure backs for my Graflex Super Graphic!(posted 8664 days ago)I shall shed tears in my coffee. :-(
Macophot sells their IR film in 4x5, but that stuff doesn't have the IR sensitivity of HIE. Of course, nothing in MF-LF would show the blown effects of HIE in 35mm, except for Hasselblad 35mm.