We had a period battle scene and the camera was on a crane with a 40mm lens, so we saw this huge landscape. There was a modern fence off in the distance. Even though I had spotted it with binoculars, we had to take care of it, because I knew it would show up on that big screen. The resolution is that good. I often have to use binoculars to scan the scene.
IMAX cameras are loud.
We used a combination of methods. Sometimes if there was a lot of dialogue, we would use a longer lens and back the camera off. We used ADR of course. Then our sound designer, Tim Archer at Masters Workshop in Toronto, suggested that after we photograph the scene that we should let the actors run through the scene again, just like they were performing for the camera. We used a lot of that audio, which was great for the performances.