Click here to go to the first RED TEAM post in this thread.   Thread: Outer ISO space...

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  1. #31  
    As I understand it, the lighting, filters, lens, aperture and shutter speed define the exposure. These are the physical parameters that define how much light is entering the camera. If I set these things, regardless of what I set my camera ISO too, I will have the identical RedCODE RAW file.

    While shooting, the ISO setting defines the conversion curve from the linear RAW data to the log/gamma of the on-set monitors. When using a light meter, I dial the ISO setting into it in order to determine the correct exposure. Adjusting the ISO doesn't change the exposure though.

    In post, the ISO is just a way to modify the intensity conversion curves of the image - and possibly the debayer process, if there's some additional magic to be had there.
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  2. #32  
    I think Spiff's explanation is very clear... should probably go into a FAQ.
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