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Canon EOS Canon 20D camera diagram for partial metering
(Spot Metering) and Manual Exposure / Operational cheat sheet

Spot / Partial metering specifications (approx)

Spot covers 9% of the viewfinder area - 6mm spot diameter
19degrees
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


Canon EOS 20D Spot Metering technical information


Actual Dimensions: 15mm x 22.5mm

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 Spot angle (acceptance) for this camera with a 27mm (approx) normal lens is about 12.5° (degrees).

The percentage area occupied by this 30 sq. mm Partial Metering frame is about 9%.

Please note: A Canon 20D's Partial meter with a 97mm lens will become a powerful spot meter with a spot angle (acceptance) of about 4° (degrees) matching Nikon D70's spot angle with a 31mm lens (approx).

Hard-to-find information about your camera's spot meter (spotmeter)

 

Camera's make and model

Diameter of the spotmetering / partial metering circle (or region) in mm

Percent area of viewfinder region occupied by the spot circle

Angle of measure (acceptance) in degrees (° ) with a 50 mm normal lens (24x36mm frame)

Nikon N90 / N90s (N-90) / spot frame

3.00 mm

0.82 %

3.44°

Nikon N70  / spot frame

3.00 mm

0.82 %

3.44°

Nikon N6006  / spot frame

3.50 mm

1.11 %

4.00°

Nikon 8008s  / spot frame

3.50 mm

1.11 %

4.00°

Nikon F5 /NO SPOT FRAME

4.00 mm

1.50 %

4.60°

Nikon F100 (F-100) /NO SPOT FRAME

4.00 mm

1.50 %

4.60°

Olympus OM-4TI (OM4TI)  / spot frame

4.70 mm

2.00 %

5.40°

Olympus OM-3TI (OM3TI)  / spot frame

4.70 mm

2.00 %

5.40°

Olympus OM2000 / spot frame

4.70 mm

2.00 %

5.40°

Pentax ZX-5N  / spot frame

5.00 mm

2.30 %

5.80°

Canon EOS 1n  / spot frame

5.00 mm

2.30 %

5.80°

Nikon F4s  / spot frame

5.00 mm

2.30 %

5.80°

Pentax PZ1p  / spot frame

5.24 mm

2.50 %

6.00°

Canon T-90 (T90)  / spot frame

5.45 mm

2.70 %

6.24°

Minolta Maxxum 800si  / spot frame

5.50 mm

2.80 %

6.30°

Minolta Maxxum 700si  / spot frame

5.50 mm

2.80 %

6.30°

Minolta Maxxum 500si  / spot frame

5.50 mm

2.80 %

6.30°

Canon EOS A2/A2E  / spot frame

6.21 mm

3.50 %

7.11°

Canon EOS 20D / Spot Frame

6mm

9%

12.5° (27mm lens: 15X22.5mm 
CCD frame)

Canon EOS Rebel series *

10.2 mm

9.50 %

11.68°

Nikon N50 /Partial Frame

12.0 mm

13.1 %

13.69°

Simplified and approximate - For illustration purposes only. Information sorted in the order of low (most accurate) to high (least accurate) angle of measure for a 50mm lens.

* These cameras do not have a circular spot area. Numbers are approximated

 

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