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
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| f | focal lenght (in mm) | |
| h | object vertical dimension | |
| l | object horizontal dimension | |
| D | object 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 object | f= 9.6 D/h | f= 6.6 D/h | f= 4.8 D/h | f= 3.6 D/h | f= 2.4 D/h |
| Knowing the width of the viewed object | f= 12.7 D/l | f= 8.8 D/l | f= 6.4 D/l | f= 4.8 D/l | f= 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/f | h= 6.6 D/f | h= 4.8 D/f | h= 3.6 D/f | h= 2.4 D/f |
| To calculate the width of the viewed object. | l= 12.7 D/f | l= 8.8 D/f | l= 6.4 D/f | l= 4.8 D/f | l= 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 object | D=h f/9.6 | D=h f/6.6 | D=h f/4.8 | D=h f/3.6 | D=h f/2.4 |
| Knowing the width of the viewed object | D= l f/12.7 | D= l f/8.8 | D= l f/6.4 | D= l f/4.8 | D= 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 14-10-2009
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