I just got a Pentax Digital Spotmeter and am trying to work out how to use it for motion (other DPs I know swear by them). Do I have this roughly right?:
15 footcandles = EV 6 = T2.8/4 split @ ISO800, 24fps, 180º shutter
So I would want a gray card to give me ~EV6 back on the meter and then I would adjust the overall ratio to not exceed the camera’s usable dynamic range (and be appropriate for the scene/subject/project of course). If I want to overexpose by 1 stop then I would 2x the light to EV 7. Does that math work? How do people use these in practice?
I’ve noticed with these that if you line up the motion shutter speed tick mark along the centerline, you get an ISO/ASA of 160. Am I better off lining up on the motion shutter speed and doing the 2.33 stops math in my head (if I am shooting at ISO 800, the base/native ISO of many cinema cameras) or should I leave ISO/ASA 800 lined up on the meter and work it out the other way? Is it just a matter of what feels more natural? Thanks for any insights...