How to calculate the field of view angle of camera lens? Please give the calculation formula! Kneel down and thank you!

The camera lens often calculates the field of view angle by the diameter of the diagonal of the imaging object to the rectangular photosensitive surface, as shown in the left figure below. There is also a rectangular ruler with long sides.

Inches to calculate the viewing angle.

The calculation formula is:? Tan(ω/2)=ac/s, where s- the radius ω of the object from ac-the visual range of the lens-the visual angle.

Extended data:

Other methods of obtaining field of view angle

The field angle parameters are obtained by measurement. Wide-angle collimator is generally used for measurement because it looks like a funnel, commonly known as funnel.

Instrument. At one end of the lens to be measured, look at the scale on the glass plane at the bottom of the wide-angle collimator, and read out its angle value and maximum score.

The degree value is the field angle of the optical instrument to be measured.

Due to different focal lengths, the measured lens may not be able to observe the scale with the naked eye. A convex lens with appropriate focal length can be added as an aid.

The lens looks at the measurement results. When measuring, the measured lens should move back and forth along the optical axis until the observation angle is the largest, that is, the quilt.

Measure the field angle of the lens.

Reference source: Baidu Encyclopedia-Perspective