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

 Camera format, inch:
 Lens format, inch:
 Angle of view, degree:
 Note. It's possible to use the camera with the lens of
 the same format or larger.
Examples
 
1. Camera format, inch: 1/2
2. Lens format, inch: 1/2
3. Angle of view (vertical), degree: 30
4. خت
Lens focal length, mm: 9.0
 
1. Camera format, inch: 1/3
2. Lens format, inch: 1/2
3. Angle of view (vertical), degree: 15
4. خت
Lens focal length, mm: 13.7