At any rate, it is certainly rare in terms of how it was done – i.e. using a flash that was modified to only emit infrared light (Vivitar modified), with Kodak HIE film (which I don’t think is made any longer).
Camera: this was with the Leica m3. I liked that camera very much for infrared film because you don’t look through the lens which has a heavy IR filter on it. So you can, at least during the day, see what you’re doing. This was shot in just about complete darkness as the dancer twirled around me.