bracketing

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bracketing

 [brak´et-ing]
a technique, used in qualitative research, in which the researcher's knowledge about an experience is suspended or set aside.

bracketing 

A procedure used in subjective refraction in which large and equal steps of dioptric changes are made above and below the presumed correct answer, and then reducing the size of the dioptric changes and shifting the centre of the range, until the finest and just detectable blur is induced by equal steps above and below the refractive error. It is commonly used with patients with low vision and also to check the range of clear vision provided by a near addition.
References in periodicals archive ?
Available exposure bracketing options are standard auto bracketing (available through aperture and/or shutter speed) and ISO bracketing which keeps the speed and aperture constant but varies the ISO sensitivity to alter the exposure.
Among the still photography features of the Optura 300 and Optura Xi camcorders are built-in and pop-up flash (respectively); auto exposure bracketing and selectable focusing points, which allow users to choose from one of three focusing points to automatically place the desired subject in focus; continuous shooting mode which enables users to capture up to 30 images at three frames per second in VGA mode; and simultaneous shooting mode, which allows users to capture e-mail ready photos while shooting video.
In addition, both units offer selectable focusing points to capture sharp images of off-center subjects; StitchAssist software for creating spectacular panoramas; the ability to simultaneously record video and digital photos with the push of a button; Direct Print capabilities using Canon's Card Photo Printers and select Canon Bubble Jet printers; and Auto Exposure Bracketing to help obtain the best exposure of any scene or subject.
Autoflash Metering, Auto Exposure Bracketing, Creative Manual Control