To calculate the lens angle and field of view for your camera, you will need to know the focal length of your lens and the sensor size of your camera. With this information, you can use an online calculator or a mathematical formula to determine the angle of view and field of view.
One common formula for calculating the angle of view is the tangent formula, which states that the angle of view is equal to 2 times the inverse tangent of half the sensor width divided by the focal length. To calculate the field of view, you can multiply the angle of view by the distance from the camera to the subject. Keep in mind that these calculations are only approximate and can be affected by factors such as lens distortion and the curvature of the image plane.