Or is it ok to use a couple. I like 200 on my T3i but I also like to use 100 sometimes. I never go over 200 for video.
Iv heard DP say hes shooting the entire short film at the same fStop \ iso. This sorta makes sense to my limited experience. This forces light control and lighting techniques that are more cinematic.. you have to BRING the light up, or bring the light down.. you cant just DIAL the exposure in by turning the aperture down of cracking up the iso up.