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Lens Format
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Camera Format
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Multiply Lens Focal Length by
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1"
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2/3"
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1.45
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1"
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1/2"
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2.0
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1"
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1/3"
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2.91
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2/3"
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1/2"
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1.37
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2/3"
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1/3"
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2.0
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1/2"
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1/3"
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1.45
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Example 1
1" format 12.5mm lens on a 1/2" format camera.
12.5mm X 2.0 - 25mm
The picture shown on the monitor using the above example will be the equivalent field of view of a 25mm lens on a 1" camera
Example 2
2/3" format 7.5mm lens on a 1/2" format camera.
7.5mm X 1.37 = 10.275mm
The picture shown on the monitor using the above example will be the equivalent field of view of a 10.275 mm lens on a 2/3" camera.
Example 3
1/2" format 3.5mm lens on a 1/3" format camera.
3.5 mm X 1.45 = 5.08mm
The picture shown on the monitor using the above example will be the equivalent field of view of a 5.08mm lens on a 1/2" camera.
Note: You can always trade down lenses to smaller format cameras, not up. Trading up a smaller format lens to a larger format camera will result in a porthole effect in the picture.
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