Autofocus
Videos
An autofocus optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area. An electronic rangefinder has a display instead of the motor; t
Several green focus points/areas indicating where the autofocus has locked
One selected green focus point using pinpoint autofocus
Active autofocus system via infrared - Canon AF35M (1979)
Early passive autofocus system integrated in the lens with Pentax ME-F (1981)
Focus (optics)
Videos
In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on an object converge. Although the focus is conceptually a point, physically the focus
Autofocus
…An autofocus (AF) optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical…
A demonstration of camera focus on different distances, showing a bamboo rooftop
Text on a page that is partially in focus, but mostly not in varying degrees