Lens Format	Camera Format	Multiply Lens Focal Length by
1"	2/3"	1.45
1"	1/2"	2.0
1"	1/3"	2.91
2/3"	1/2"	1.37
2/3"	1/3"	2.0
1/2"	1/3"	1.45

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. Back to Lens Basics