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Glossary, Technical Notes

Magnification Calculator

Image sensor format (1", 2/3", 1/2", 1/3") is used to calculate the optical magnification necessary to view an object at a fixed distance. Optical magnification is the most important consideration for the selection of a telecentric lens.

The following table shows the related formulas.

Area sensor sizes

area sensor sizes

Line sensor sizes

The length of a line sensor provides the pixel size and resolution.

line sensor sizes

The following tables refer to area sensors
H = object height
L = object length
M = magnification (0.5x, 1.0x, 2.0x etc)

How to find the magnification needed to view an object of known dimensions

Sensor format	1"	2/3"	1/2"	1/3"
Knowing the height of the object to view	M = 9.6/H	M = 6.6/H	M = 4.8/H	M = 2.7/H
Knowing the length of the object to view	M = 12.8/L	M = 8.8/L	M = 4.8/L	M = 3.6/L

How to find the field of view (L x H) of a telecentric lens with a known magnification

Sensor format	1"	2/3"	1/2"	1/3"
To find the height of the object to view	H = 9.6/M	H = 6.6/M	H = 4.8/M	H = 2.7/M
To find the length of the object to view	L = 12.8/M	L = 8.8/M	L = 4.8/M	L = 3.6/M