Lens Handbook

Trading Down Lenses

 

Lens Format Camera Format Focal Length by

2/3"

1/2"

1.37

2/3"

1/3"

2.00

1/2"

1/3"

1.45

 

example 1

2/3" format 8mm lens on a 1/2" format camera.
8mm X 1.37 = 10.96mm

The picture shown on the monitor using the above example will be the equivalent field of view of a 10.96mm lens on a 2/3" camera rather than an 8mm lens.

example 2

1/2" format 6mm lens on a 1/3" format camera.
6mm X 1.45 = 8.7mm

The picture shown on the monitor using the above example will be the equivalent field of view of a 8.7mm lens on a 1/2" camera rather than a 6mm lens.

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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