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Autofocus (AF) can either activate until a lock is found (single, AF-S) or be continuously active (continuous, AF-C, servo). Single-mode is especially favored for stationary subjects, when focus, once found, should stay fixed, while the continuous mode is used for moving subjects.
Most multi-sensor AF cameras allow manual selection of the active sensor, and many offer automatic selection of the sensor using algorithms which attempt to discern the location of the subject. Some AF cameras are able to detect whether the subject is moving towards or away from the camera, including speed and acceleration, and keep focus — a ...
The F-501 uses a through-the-lens (TTL) "passive" phase-detection autofocus method for establishing focus. Unlike active systems, which set approximate focus based on distance to the subject, the "passive" system uses a CCD to "see" the focus subject and focus in a manner similar to a human operator. This method is more precise than the active ...
The following list of Nikon F-mount lenses with integrated autofocus motor includes only Nikon F-mount lenses which fully autofocus in all modes of all Nikon F-mount digital single-lens reflex cameras with and also without an autofocus motor. [1] Cameras lacking an integrated autofocus motor (often called screw drive) are the Nikon D40, D40X ...
The use of separate PDAF sensors has been favored in DSLR systems because of mirror box and pentaprism design, along with better performance for fast-moving subjects. The (non-Micro) Four Thirds system design standard specifies a 40 mm flange focal length distance, which allowed for using a single lens reflex design, with mirror box and pentaprism.
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Autofocus is a camera's ability to focus a lens automatically on an object by pressing down on the shutter button. Autofocus most often chooses the closest image in the field of view to focus on. [4] The following EOS cameras feature such a system, with 61 points unless otherwise indicated: The EOS 5D Mark III, introduced in March 2012. [5]
Digital cameras with fixed lenses are not usually subject to dust from outside the camera settling on the sensor. DSLRs generally have more significant cost, size, and weight. [52] They also have louder operation, due to the SLR mirror mechanism. [53] Sony's fixed mirror design manages to avoid this problem.
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