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Old 03-17-2008, 03:27 PM   #9
alan-crotty
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Join Date: Mar 2006
Location: Ashford Kent England
Posts: 349
Default In The Zone

Steve,
When using SPOT metering it's most important to understand lighting 'zones'.

Camera meters are stupid and are calibrated to assume they are pointing at an 18% grey image (supposedly that's the shade you get if all the colours/shads of an average scene are blended together).

So you must either spot meter from an 18% grey area, or know how many f stops lighter or darker than 18% your target is.

See

http://en.wikipedia.org/wiki/Zone_system

For a detailed explanation.

I just meter from green grass or grey road.

Also you need to understand the Dynamic range of your camera, 40D will be about 7 f stops.


Alan
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