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Subject: Re: raw 3.1 professional custom profiles for highend digital cameras



Bruce, with respect to determining the camera's "true ISO," you reported that:

"I used a Minolta Spotmeter F I borrowed from Jeff Schewe to determine that my Kodak DCS 460's ISO 100 was really ISO 80, my Canon 300D's ISO 100 was actually ISO 125, and my Canon 20D's ISO 100 really was pretty damn close to ISO 100, as follows."

If I don't have access to a good spot meter (and my LunaPro is apparently out of the running...), can't I replicate this experiment using the camera's on-board spot meter and just under and over exposing by 1/3 stop increments then determining what ISO would match the results? Actually,won't that give me the info that I really need, anyway, which is to determine what EV comp my camera needs on a generalized basis?

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