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07/11/2006 12:59:45 PM · #1 |
I may really be showing my ignorance here (why should this thread be different from all my others) BUT...
From my understanding light meters try to balance the light out and make everything the equivalent of 18% grey when giving exposure compensation.
My question is - in the modern age of digital cameras and technology - why can't they make cameras meter off the equivalent of a histogram? When I check my exposure on the LCD I'm checking the Histogram to see that it was exposed properly - so why couldn't the camera essentially do the same thing for pre-exposure metering? (or does it?) |
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07/11/2006 03:30:20 PM · #2 |
It does that and more when using the less manual metering modes.
The problem with that is how should the histogram be read? Nearly ever photograph has a different intended look, so the histogram will look different each time.
David
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07/11/2006 03:38:25 PM · #3 |
When in 3D Matrix Metering, it tries to make a best guess at proper exposure using the light at 1000 sensors, focus distance, and a database in the camera of typical scenes. But it is only a guess and once you learn the basics of photography you can generally do better. You have at your disposal the histogram (and image) of the previous shot which was made with 6 million sensors, the ability to spot meter (and use manual exposure modes to set exactly the exposure you want), and much more knowledge of the scene then the camera has.
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