X-don
Imported Account
Sep 20, 2003, 7:46 AM
Post #2 of 2
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Re: XL-1 ASA rating
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: Anybody know whats the ASA for a PAL XL-1
: shutter 1/50 0dB and 1/100 and 1/125
ASA (AKA ISO) speed rating for a video camera is not well defined because video has a different light sensitivity curve than film. Further video gives immediate feed back (on a monitor) so you do not need to use an ISO rating and light meter to "guess" at the right exposure. But it can be of some help in checking set lighting before the camera arrives.
That said, some folks consider the effective ISO at 0 dB gain and normal video mode to be in the order of 300, give or take a stop. If you plan to use an ASA rating with you camera, run some tests to determine which speed rating works best for your shooting. Select serveral typical scenes you plan to shoot, check the expsoure (aperture, shutter, and gain) for properly exposed video, then see what ASA that combination corresponds to in a light meter readign of the same scene.
Note that with respect to gain, 0 dB corresponds to normal processing of film, 6 dB is a 1-stop push processing, 12 dB is a 2-stop push, and -3 dB is a 1/2-stop pull.
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