ÖDG Lehrer

The field of view FOV of an optical system is often expressed as the maximum angular size of the object as seen from the entrance pupil. The maximum image height is also used. For finite conjugate systems, the maximum object height is useful.Field of view FOV: the diameter of the object/image Half field of view HFOV: the radius of the object/image

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Full field of view FFOV is sometimes used for FOV to emphasize that this is a diameter measure. Since the EP is the reference position for the FOV, this defining ray becomes the chief ray of the system.For distant objects, assuming a thin lens in air with the stop at the lens:

The system FOV can be determined by the maximum object size, the detector size, or by the field over which the optical system exhibits good performance. For rectangular image formats, horizontal, vertical and diagonal FOVs must be specified.

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