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Calculating the focal length
of a lens
(by field of view)

 Camera format, inch:
 Lens format, inch:
 Object distance, m:
 Field of view, m:
 Note. It's possible to use the camera with the lens of
 the same format or larger.
Examples
 
1. Camera format, inch: 1/3
2. Lens format, inch: 1/3
3. Object distance, m: 50
4. Field of view (horizontal), degree: 12
5. خت
Lens focal length, mm: 20.0
 
1. Camera format, inch: 2/3
2. Lens format, inch: 1
3. Object distance, m: 10
4. Field of view (vertical), degree: 3
5. خت
Lens focal length, mm: 22.0