Date: Thu, 07 Aug 2003 16:28:13 -0400 From: "Mr. Bill" <[EMAIL PROTECTED]> Subject: Re: EOS 10d metering and shutter rants
But tell me, how do you think the camera can decide wether there is a black door in bright sun or a white door in deep shade in front of it? Try it, both will have the same partial meter reading. One needs correction plus, the other minus. But how to decide? And what if the door is indeed gray? The camera can't recognize the nature of a subject, you have to do it.
This is an interesting question. The partial metering system should give the same result for both of these scenes,
Yes, and for both the black as well as the white door it would be off. The black door should end up in zone 2 or 3, the white door in 7 or 8 (in real life doors)
but if the matrix or evaluative system is working you should get very different results.
More precisely *unpredictably* different results. With partial you know the camera thinks everything is a gray card, and you can predict the error in quantity and direction.
With evaluative, matrix, pattern or whatever it is called, you know nothing. Which is not acceptable for my professional requirements.
With the black door, the matrix/evaluative system should think: "the outer segments are brighter than the center this is probably a backlit
scene - give the film more exposure than the average metering calls for to avoid a dark face."
Possible. Would even add to the error. The door would be way overexposed. But what, if the wall is a deep red? Or also black?
With the white door, it should think: "this might be a bride against a black/distant background, give less exposure than called for to hold
detail in the dress."
Which results in a dull gray door and underexposed shots.
At least that's what I hope it's doing!
You shouldn't, because that would be wrong.
But even if it did *this* situation right, how do I know it will do the next one right? The camera has no means of identifying the nature of a subject. The photographer has to do that.
-- Michael Quack <[EMAIL PROTECTED]>
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