Gabriel Rochette Posted February 27, 2007 Share Posted February 27, 2007 Goog way or not ????? To find the ISO of a camera video: lighting a gray cart 18% with a spot 3200K Frame the gray cart and put the iris in auto mode.... Look the result ex: f/2.8 Take a light mesure with a photometer (incident one) Look the result... and shift the ISO dial until finding the f stop of the camera Read the ISO value I't is good and safe??? Thank you Gabriel Rochette Link to comment Share on other sites More sharing options...
Daniel Sheehy Posted February 27, 2007 Share Posted February 27, 2007 Hi, As discussed here apparently 18% grey isn't the best way to go with the video cameras. Better to take a reading from an average scene (no excessive hightlights, no large black holes) and then match the ISO that way. Link to comment Share on other sites More sharing options...
David Bradley Posted February 27, 2007 Share Posted February 27, 2007 Everytime I have tested a video camera's speed I have hit approximately 320 ISO. The sony f900 is at that speed, as is the 570ws, the 450ws and the dvw790. I used the method you have described above and I would say its the been the best way in my experience short of a waveform monitor. Link to comment Share on other sites More sharing options...
Premium Member Michael Nash Posted February 27, 2007 Premium Member Share Posted February 27, 2007 "Beware the auto iris..." The auto-iris on video cameras is quite often set too high, putting a gray card well above 50 IRE. You're better off using a waveform monitor to set the desired brightness, probably closer to 45-50 IRE depending on the look you want. Without a waveform monitor you can use a properly set up monitor and set a correct exposure by eye, cross referencing the gray card and other subjects until you come up with a sensitivity that's consistent. But as already stated, the effective ISO of a camera can vary with the light level, and "proper" exposure may be determined by the highlights as much as the midtones. Use the effective ISO as a rough guide for lighting only; don't set your exposure by it. Link to comment Share on other sites More sharing options...
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