Managed to finally get an Iridium Flare on digital film.. This is Iridium 6, at 8:40pm last night..
The sky was still quite bright, so over the 15 second exposure it lightened it even more, and because it wasn't dark, I didn't see the flare until it was already quite bright.. so I missed the beginning
Still, there's always next time. This one reached -8! Soooo bright it was unbelievable!