In photography, manual focus override, also known as full-time manual focus, allows manual intervention in the
autofocus
An autofocus (or 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 ...
acquisition process simply by turning the
focus ring
In the field of photography, a manual focus camera is one in which the user has to adjust the focus of the lens by hand. Before the advent of autofocus, all cameras had manually adjusted focusing; thus, the term is a retronym.
The focus itself m ...
on a photographic lens.
There are a number of technologies used to implement this feature.
Pentax
is a brand name used primarily by the Japanese multinational imaging and electronics company Ricoh for DSLR cameras, lenses, sport optics (including binoculars and rifle scopes), and CCTV optics. The Pentax brand is also used by Hoya Corporatio ...
uses the trademark ''
Quick Shift'' to refer to its implementations of manual focus override.
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Photography equipment