I'm shooting an extended project that will include some concert photography. The venue forbids flash photography during the show, which presents something of a problem. Light levels will be low and I don't want to have to switch to digital for this section of the project. So, I thought about shooting Rollei IR 400 with an IR flash. I am not looking for the IR look, so I will not use an IR filter on the camera lens. Instead I am aiming for the IR filtered flash to act as an invisible IR fill light that will be picked up by the extra IR sensitivity of the film. So, essentially I will shoot: - Mixed light - No IR filter on lens - Heavy duty IR emitting flash (on camera) - Rate Rollei IR 400 @ 400 Also does anyone have any experience pushing Rollei IR 400 to 800 or 1250? I'm going to run a few tests in advance, but would like to hear from anyone who has experience with this. Thanks in advance.