Search results
Results from the WOW.Com Content Network
Manual focus is generally in release priority – AF is neither detected nor set. Note that these "priority" modes should not be confused with the same word in exposure modes. Focus priority can also be used for the trap focus trick: to take a picture only when a subject hits a focus point, by using AF to detect focus but not set it.
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 system has to be done manually until indication.
Before the advent of autofocus, all cameras had manually adjusted focusing; thus, the term is a retronym. The focus itself may be adjusted in a variety of ways. Larger view cameras and the like slide the lens closer or further from the film plane on rails; on smaller cameras, a focus ring on the lens is often rotated to move the lens elements ...
The auto-focus function does not work on any other camera, although they can be used as manual-focus FD lenses. However they lack aperture rings, so they are only useful on FD camera bodies that could control the aperture from the body. There is one other Canon FD autofocus lens, the Canon New FD 35-70 mm f/4 AF. This was introduced in 1981 ...
In photography, manual focus override, also known as full-time manual focus, allows manual intervention in the autofocus acquisition process simply by turning the focus ring on a photographic lens. There are a number of technologies used to implement this feature.
The F4 is able to accept any of Nikon's manual focus (MF) or AF lenses from 1959 to the present day, including the two F3AF lenses (in Autofocus mode). The F4 succeeded the F3 , a manual focus camera introduced in 1980 but outlasting the F4 as it stayed in production until 2001.
A new active auto-focus system has been added to the G2, which uses near-infrared beams to set the range. [4] The G2 auto-focus also has two focusing modes: continuous, which constantly adjusts focus as the camera is moved; and single, which is a safety mode, focussing as the focus button is pressed (or shutter release half-pressed), and ...
Focus can be set with an active-infrared autofocus or by manual adjustment. In autofocus mode, a central indicator in the viewfinder shows the point the camera will attempt to focus on and a lamp in the viewfinder indicates that focus has been achieved when the shutter release is half pressed. Focus remains locked until the shutter release is ...