The perspective refers to the angle that humans, animals, or shots can relate to, photograph, and see. The narrower the dioptric angle (the smaller the angle), the smaller the field of view or scenery that can be seen without moving the eyes. Wide viewing angles are the opposite. The angle formed by the lens center point to the imaging plane at both ends of the diagonal line is the lens angle of view. For the same imaging area, the shorter the focal length of the lens, the larger the angle of view. For the lens, the angle of view mainly refers to the range of angles it can achieve. When the focal length becomes shorter, the angle of view becomes larger, and a wider range can be shot, but this will affect the sharpness of the distant objects. When the focal length becomes longer, the angle of view becomes smaller and the distant objects can be made clear, but the width of the range that can be photographed becomes narrower.
Field of view angle
The field of view angle refers to the maximum range of angles that optical instruments (especially optical observation instruments such as telescopes) can observe. This is a term used in celestial optics. The larger the field angle, the smaller the magnification. The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view and the smaller the optical magnification. In layman's terms, target objects beyond this angle will not be captured in the lens.
definition:
1. In optical instruments, the angle of the lens of an optical instrument is used as the vertex, and the angle at which the object image of the object to be measured passes through the two edges of the largest range of the lens is called the field angle. As shown in Figure 1.
The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view and the smaller the optical magnification. In layman's terms, target objects beyond this angle will not be captured in the lens.
2. In the display system, the viewing angle is the angle between the edges of the monitor and the viewing point (eyes).
For example, in Figure 2, the AOB angle is the horizontal field of view and the BOC is the vertical field of view.
Field of View - The lens is classified according to the angle of view of the standard lens: The angle of view is about 30 degrees, and the range of use is wider.
Telephoto Lens: Within 20 degrees of viewing angle, you can shoot at a distance.
Wide-angle lens: The angle of view is more than 90 degrees, the observation range is large, and the near image is deformed
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