Canon EOS 30D Digital camera (D-SLR) diagram 
for spot metering and Manual Exposure / Operational cheat sheet

Canon 30D: Area occupied by the spot Metering frame/circle is 3.5% of the View Finder area
Canon 30D:  Angle of measure/Acceptance is 12.3º (degrees) with an 18mm lens
Canon 30D:  Angle of measure/acceptance is 7.4º (degrees) with a 30mm normal lens
Canon 30D:  Angle of measure/acceptance is 4º (degrees) with a 55mm lens
Canon 30D:  Angle of measure/acceptance is 1º (degree) with a 222mm lens

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Canon 30D Spot Metering
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