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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 by means of a helical screw. Other systems include levers on the lens or on the camera body.
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.
Focus mode switch: This switch is found on most EF lenses that have an autofocus feature. It is used for setting the lens to either autofocus mode, or manual focus. When set to autofocus mode (AF), the lens will autofocus when directed to by the camera. When set to manual focus (MF), the lens is focused using the Focusing ring. Some lenses ...
An Arri 35mm film camera with a follow focus mechanism mounted to a zoom lens. Pulling focus using a follow focus device. A follow focus is a focus control mechanism used in filmmaking with film cameras and in television production with professional video cameras. It helps the camera operator be more efficient and precise.
DMC-LX: compact high-end camera line, with full manual exposure and focus controls (with joystick control rather than focus ring), and RAW recording, unusual in compact cameras. DMC-LZ: budget, but more advanced and with more user control than many other digital compact cameras. The most notable feature is a 6x (37–222 mm) optical zoom range.
Camera software on more recent and higher-end smartphones (e.g., Samsung since 2015) allows for more manual control of parameters such as exposure and focus. This was first featured in 2013 on the camera-centric Samsung Galaxy S4 Zoom and Nokia Lumia 1020 , but was later expanded among smartphones.