its mainly more a problem with digital imaging with out sounding boring here lol, if we take mid tones as zone-5 we have high lights in zone-6/7 and shadow in zone-4/3 in digital images... in film there are more zones so you capture more tones moving on from that the way the image is stored there are more tone values captured in the mid tones and high lights and the shadows have few tone values. And that is why it is notoriously hard to restore shadows in post processing. It is also very difficult to restore highlight detail passed a certain point.
Hope you didnt fall asleep reading lol.
And that is why they say meter for the mid tones which means what ever your mid tone is (average colour) your meter is zero on spot metering then check the highlights which will be the brightest parts of the shot and check it isnt blinking, to try to make sure the most tonal detail can be captured. You can also use it as a quick check to see if a shot is possible or to evaluate a scene
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You cant fool all of the people all of the time, some of the time all of the people will some of time but not all of the time as some of the time all of the people will some of the time but all of the people will not all of the time  !!
Last edited by teaking; 11-07-2009 at 12:29 AM.
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