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2. Angle of view (photography) - Wikipedia

   en.wikipedia.org/wiki/Angle_of_view_(photography)

   In photography, angle of view ( AOV) [1] describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view . It is important to distinguish the angle of view from the angle of coverage, which describes the angle range that a lens can image.

3. Wide-angle lens - Wikipedia

   en.wikipedia.org/wiki/Wide-angle_lens

   For example, a 28 mm lens on the DSLR (given a crop factor of 1.5) would produce the angle of view of a 42 mm lens on a full-frame camera. So, to determine the focal length of a lens for a digital camera that will give the equivalent angle of view as one on a full-frame camera, the full-frame lens focal length must be divided by the crop factor.

4. Focal length - Wikipedia

   en.wikipedia.org/wiki/Focal_length

   Focal length. The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a ...

5. Field of view - Wikipedia

   en.wikipedia.org/wiki/Field_of_view

   FOV both eyes Vertical FOV Angle of view can be measured horizontally, vertically, or diagonally. A 360-degree panorama of the Milky Way at the Very Large Telescope.In the image, the Milky Way appears like an arc of stars spanning horizon to horizon with two streams of stars seemingly cascading down like waterfalls.

6. Normal lens - Wikipedia

   en.wikipedia.org/wiki/Normal_lens

   A normal lens typically has an angle of view that is close to one radian (~57.296˚) of the optical system's image circle. [citation needed] For 135 format (24 x 36 mm), with an escribed image circle diameter equal to the diagonal of the frame (43.266 mm), the focal length that has an angle of one radian of the inscribed circle is 39.6 mm; the focal length that has an angle of one radian of ...

7. Numerical aperture - Wikipedia

   en.wikipedia.org/wiki/Numerical_aperture

   The numerical aperture with respect to a point P depends on the half-angle, θ1, of the maximum cone of light that can enter or exit the lens and the ambient index of refraction. As a pencil of light goes through a flat plane of glass, its half-angle changes to θ2. Due to Snell's law, the numerical aperture remains the same: NA = n1 sin θ1 ...