Video ISO

Just a pet question of mine, i know video cameras have gain control, but there exposure meters still work in terms of shutter speed and aperture, so is it possible to determie what the iso of a video camera is. i know there are special lightmeters that use an ev reading for video, but nobody has properly explained it for me. i am used to thinking in iso as i started out in still photography. mostly i could read the camera's built in lightmeter but sometimes when i want more control it would be handy to calculate a cameras iso equivalent.

My class and I have been running tests on that exact question this past week. We have a sekonic L358 meter that says to set for 100 ISO and 30 f/s to determine either the EV or Fstop. I find that when using a PD150 at 0DB that we are over exposing by 1 stop. The sekonic reads 2.0, the Sony on the scope prefers 4.0. We have standardized on a 200 ISO when metering under hot lights for the PD's. The results look very good on the waveform/vector scope and compare well with exposures taken with a Nikon D70 using the same 1/60, F4 and set at ISO200.

It may not work for other cameras, but it seems to be a good starting point for the Sony's

Good luck with the experimentation.