Optical calculator
Focal lenght calculator

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Focal lenght calculator - Magnification calculator

You can calculate the focal lenght needed to view an object at a fixed distance, by knowing the image sensor format (1", 2/3", 1/2", 1/3", 1/4").

By knowing the focal lenght of the lens to be used, you can also calculate the dimensions of the viewed area.

The following tables show the related formulas

ffocal lenght (in mm)
hobject vertical dimension
lobject horizontal dimension
Dobject distance from lens

Sensor sizes

 

How to find the focal lenght
choosing the suitable lens in order to view a subject with known dimensions at a fixed distance

Sensor format

1"

2/3"

1/2"

1/3"

1/4"

Knowing the height of the viewed objectf= 9.6 D/hf= 6.6 D/hf= 4.8 D/hf= 3.6 D/hf= 2.4 D/h
Knowing the width of the viewed objectf= 12.7 D/lf= 8.8 D/lf= 6.4 D/lf= 4.8 D/lf= 3.4 D/h

How to find the object dimensions
checking the  dimensions of the viewed subject  when using a choosen lens at a fixed distance

Sensor format

1"

2/3"

1/2"

1/3"

1/4"

To calculate the height of  the viewed object.h= 9.6 D/fh= 6.6 D/fh= 4.8 D/fh= 3.6 D/fh= 2.4 D/f
To calculate the width of  the viewed object.l= 12.7 D/fl= 8.8 D/fl= 6.4 D/fl= 4.8 D/fl= 3.4 D/f

How to find the distance of a viewed subject
calculating the right distance to view a subject with a choosen lens

Sensor format

1"

2/3"

1/2"

1/3"

1/4"

Knowing the height of the viewed objectD=h f/9.6D=h f/6.6D=h f/4.8D=h f/3.6D=h f/2.4
Knowing the width of the viewed objectD= l f/12.7D= l f/8.8D= l f/6.4D= l f/4.8D= l f/3.4

Be careful: after choosing your lens take care that the working distance is not smaller that the minimum focusing distance. In this case you must use extension rings or close-up lenses.

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Last modified 10-05-2013
 
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