20D Diagram
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Canon EOS 20D (Canon 20D) Digital camera (D-SLR) diagram for partial metering
and Manual Exposure / Operational cheat sheet

Spot / Partial metering specifications (approx)

Spot covers 9% of the viewfinder area - 6mm spot diameter
with an 18mm lens
11.5 degrees with
a 30mm normal lens 
6.2 degrees with a 55mm lens
1 degree with a 344mm lens

What is a Partial Meter?
A Partial Meter is a less accurate type of spot meter with an approximate angle of measure (acceptance)
of about 7 to 13. The angle of some Partial Meters (like Canon A2/E, Digital 10D, and 20D that 100% of the light measured passes through the spot circle), can be reduced to fall within the spot metering angles using a telephoto zoom lens (the higher the mm of the lens, the smaller/narrower the angle) . In this case they can be used as a spot meter.

Partial Metering Example for 
Canon 20D
D-SLR (Digital SLR)
Aspect Ratio: 15/22.5 = 2/3
Diagram illustrating the spot frame for Canon EOS 20D (Digital SLR) viewfinder. The angle of sensitivity (acceptance) for this camera with a 27mm (approx) normal lens is about 12.48 (degrees).
The percentage area occupied by this 30 sq. mm Partial Metering frame is about 9%.


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2006 confused photographer's guide books - excerpts from Simplified zone system and on-camera spotmetering (spot metering)