I'm trying out the new Efke IR820c (Which is the same as the Maco 820c) because it's easily available in 120 format for my RB67.

The problem, of course, is that it's much harder to work with than HIE, both because it's 2 stops slower, but also because it needs a darker filter to work. My IR stuff I used a 25 red filter. This I used a opaque 87 filter.