Home » Full Forms » Computer Acronyms/Abbreviations

What is the full form AF?

Full form of AF: Here, we are going to learn what does AF stands for? AF – which is an abbreviation of "Autofocus" in Computer Acronyms/Abbreviations, etc.
Submitted by Anushree Goswami, on March 23, 2020

AF: Autofocus

AF is an abbreviation of "Autofocus".

It is an optical system, which makes use of a sensor, a control system and a motor to put a focus on an automatically or manually chosen spot or region. An electronic rangefinder has a display as an alternative of the motor; the process of adjustment of the optical system has to be carried out manually until indication. Autofocus techniques are well-known by their category as being one of the three given following:

Active variants
Passive variants
Hybrid variants

Autofocus systems depend on one or more sensors to find out the correct focus. Several AF systems depend on a single sensor, at the same time as others use a range of sensors. The majority of current SLR cameras use through-the-lens optical sensors, with a split sensor array offering light metering, even though the latter can be programmed to designate as very important it's metering to a similar spot as one or more of the AF sensors.

Optical autofocusing is now frequently speedier and highly accurate than can be accomplished manually with a normal viewfinder through the lens, even though highly accurate manual focus can be accomplished with exceptional accessories such as focusing magnifiers.
Autofocus accurateness within 1/3 of the depth of field (DOF) at the widest aperture of the lens is ordinary in professional AF SLR cameras.
The majority of multi-sensor AF cameras enable manual selection of the active sensor, and a lot of provides automatic selection of the sensor by using algorithms that attempt to acquaint with the difference in the location of the subject.
Several AF cameras can perceive whether the subject is moving towards or away from the camera, comprising speed and acceleration data, and keep the focus on the subject — a function used primarily in sports and other action photography; on Canon cameras, this is known as AI servo, whereas on Nikon cameras it is known as "continuous focus".
The data accumulated from AF sensors are used to have management control over an electromechanical system that adjusts the focus of the optical system.
A modification of autofocus is an electronic rangefinder, a system in which focus data are made available to the operator, other than the adjustment of the optical system is still carried out manually.
The speed of the AF system is extremely dependent on the widest aperture provided by the lens at the present focal length.