defocus


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defocus

[dē′fō·kəs]
(engineering)
To make a beam of x-rays, electrons, light, or other radiation deviate from an accurate focus at the intended viewing or working surface.
References in periodicals archive ?
8 aperture, it can produce impressive, exceptionally sharp portraits with soft background defocus that take advantage of its 85mm focal length and wide F1.
p] is defocus of focal length caused by atmospheric pressure change; p is atmospheric pressure at certain altitude; [p.
The slider on the right side of the screen will allow users to adjust the level of defocus either horizontally or vertically.
Glasses or contact lenses that correct the defocus on the main visual axis can create a slight degree of farsightedness in the peripheral retina, David Troilo at SUNY College of Optometry in New York City explained.
The focusing predicted by ray theory generally agrees with the experiment, although initially these rays defocus as they are caught in the dipole.
This activity will extend an exclusive opportunity for photography enthusiasts to actually 'touch & feel' the product & experience live demo of the NEX-5 & Nex-3 cameras while understanding its various features like the HD Movie Recording, 3D Sweep Panorama and Background Defocus Function.
Both models incorporate background defocus and superior auto shooting modes.
2 megapixel TX9 and WX5 models offer new features including Background Defocus, which simulates depth of field control and Superior Auto mode, which provides low image-noise levels previously only available from DSLR cameras.
The near-work theory suggests that near work leads to retinal defocus in children who are genetically predisposed to myopia.
It seems that they are going to great lengths to keep the truth from coming forward and especially that they are trying to defocus people from looking at the issues and the complaint," she says.
Although the older observers required somewhat spherical defocus to degrade acuity to 20/30 and 20/40, the difference was not significant (p = .
He maintains strong links with academia as a visiting lecturer at Aston, and is continuing his research by exploring the effect of peripheral defocus on axial growth and modulation of refractive error in hyperopes.