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Home > Art, Film & Photography > Photography & photographs > Autofocus
Autofocus

Autofocus


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About the Book

An Autofocus optical system uses a sensor, a control system and a motor to focus fully automatic or on a manually selected point or area. An electronic rangefinder lacks the motor; the adjustment of the optical system has to be done manually until indication.Autofocus systems rely on one or more sensors to determine correct focus. Some AF systems rely on a single sensor, while others use an array of sensors. Most modern SLR cameras use through-the-lens optical AF sensors, with a separate sensor array providing light metering, although the latter can be programmed to prioritise its metering to the same area as one or more of the AF sensors.Through-the-lens optical autofocusing is now often speedier and more precise than what can be achieved manually with an ordinary viewfinder. Autofocus accuracy within 1/3 of the depth of field at the widest aperture of the lens is not uncommon in professional AF SLR cameras.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.


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Product Details
  • ISBN-13: 9786130801885
  • Publisher: Alphascript Publishing
  • Publisher Imprint: Alphascript Publishing
  • Height: 152 mm
  • No of Pages: 64
  • Spine Width: 4 mm
  • Width: 229 mm
  • ISBN-10: 6130801882
  • Publisher Date: 02 Aug 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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