focus control

focus control

[′fō·kəs kən‚trōl]
(electronics)
A control that adjusts spot size at the screen of a cathode-ray tube to give the sharpest possible image; it may vary the current through a focusing coil or change the position of a permanent magnet.
(optics)
A device to adjust a lens system to produce a sharp image.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
LEAD's camera control supports image capture, video recording, flash, torch, and focus control. Developers can also tap into the live camera feed to add custom image processing or LEADTOOLS features, including OCR, barcode recognition, and image processing filters.
The HIGHmodular offers exceptional flexibility for focus control with an integrated 1D scanner, zoom collimation and a broad array of optics expansion modules.
This provides accurate and fast autofocus with touch focus control, Face Detection AF and object tracking.
Every aspect of motion control for photonics systems is covered by one of the M3 products: lens rotation using the M3-RS-U rotary stage module; linear positioning with the M3-LS range of linear smart stages; M3-L linear actuators; and lens focus control with the M3-F and M3-FS focus modules.
Necessary hardware comprises three main components: the computer-controlled motors that move the media and the optics, the laser profile sensors used for focus control, and the 2D and 3D imaging cameras.
An f/2.8 maximum aperture is effective in low light situations and offers shallow depth of field focus control. Precise manual focus is supported even in One Shot AF mode and a truly round aperture results in pleasing background blur.
While lenses like Nikon's PC-E line are still useful for their original purpose perspective control--I've seen some absolutely brilliant portrait and wedding photography that uses tilt/shift capabilities as a dreamy focus control."
Features include hands-free activation, smooth dimming and focus control (1x flood and 4x spot) and lock-out function that prevents battery drain.
Either could be delegated additional authorities by the CFACC to control operations in an area experiencing a modest level of activity, thus allowing the AOC to focus control on areas of more intense fighting.
Independent Exposure and Focus Control in Camera App