Angle of view
Angle of View
The Angle of View (pronunciation: /ˈæŋɡəl əv vjuː/) is a term used in Optics and Photography to describe the extent of a scene that is visible through a particular lens. It is a critical concept in fields such as Ophthalmology and Optometry, where it helps in understanding the visual perception of a human eye.
Etymology
The term 'Angle of View' originates from the English words 'angle' and 'view'. 'Angle' (from Latin 'angulus') refers to the space between two intersecting lines or surfaces at the point where they meet, and 'view' (from Old English 'view') refers to the act of seeing or inspecting something.
Definition
The Angle of View is defined as the angle between the two rays passing through the optical center of the lens, which are tangent to the extremities of the scene. It is usually expressed in degrees and depends on the Focal Length of the lens and the size of the image sensor.
Related Terms
- Field of View: The observable area a person can see through his or her eyes or via an optical device.
- Focal Length: The distance between the lens and the image sensor when the subject is in focus.
- Optical Center: The point in the lens where light rays passing through it converge or diverge.
Calculation
The Angle of View can be calculated using the formula:
A = 2 * arctan(d / (2f))
where:
- A is the angle of view,
- d is the size of the film or sensor, and
- f is the focal length of the lens.
Applications
The Angle of View has various applications in fields like Photography, Cinematography, Astronomy, and Ophthalmology. It helps in determining the portion of a scene that will appear within the image frame for a particular lens.
External links
- Medical encyclopedia article on Angle of view
- Wikipedia's article - Angle of view
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