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Message: <blockquote data-quote="Bob Blaylock" data-source="post: 236842" data-attributes="member: 16749"><p>I've got some faint memory of reading of a system that Olympus implemented in some of its 35mm cameras, where it metered the flash by measuring light reflected off of the film during the actual exposure.  The concept seems dubious to me, because I have to doubt that the albedo would be consistent enough from one variety of film to another for this to work reliably.  It does seem, now, thinking of it in the context of a digital camera, that since you always have the same sensor, that the albedo of that sensor could be assumed to be consistent enough for this idea to work.  Then again, why use light bounced off of the image sensor to be metered with an additional sensor, rather than doing the metering directly from the image sensor itself?</p></blockquote><p></p>