Here's my situation: shooting a no-budget 35mm short. One shot, camera never moves. Shot is 3 min. long. Lens is 18mm. Two speaking actors, both are 20 feet away and somewhat small in the frame. I have access to a FREE 35mm Mitchell (I'm assuming non-synch) or even a FREE ArriBL4
Question: How loud are these things? Also, would anyone risk audio recording a few dozen rehearsals and then using that sound (after a lot of editing and massaging)? Of course, we'd also record the camera takes but the sound might be unusable due to camera noise, and not stay in synch anyway. I have a lot of sound editing experience and think I can put the sound back together but... what a headache!
So, would YOU risk it?
Also: we'd be shooting another part of the movie on a newer camera, maybe Panavision. Am I wrong thinking that Mitchell cameras were famous for rock-steady images?