Optically, as a lens is stopped down, the defocus blur at the Depth of Field ( DOF ) limits decreases but diffraction blur increases.
12.
Consequently, early Russian lenses should not be used on postwar cameras as they will not focus correctly, although results may be adequate when stopped down.
13.
Instead the lens is stopped down as the aperture ring is turned ( allowing depth of field preview ), rather than when the shutter button is pressed.
14.
"This whole problem should have been stopped down on Fell Street, " where the homeless set up an encampment in Civic Center five years ago.
15.
This has two serious defects : The aperture ring sits inside the focus ring so cannot be stopped down after focussing, as is normal practice with manual lenses.
16.
As the shutter button was depressed the lens would firstly be stopped down to the selected aperture, then the meter would be switched on and a reading taken.
17.
American astronomer "'Percival Lowell "'at stopped down to 3 inches ( 7.6 cm ) to reduce the effects of atmospheric turbulence.
18.
The taking lens may be stopped down to help gauge depth of field effects and vignetting, but the photographer generally opens the lens to its widest setting for focusing.
19.
As a lens is stopped down from its maximum ( widest ) aperture, most lens aberrations ( spherical aberration, astigmatism ) are decreased, but lens diffraction increases.
20.
They can achieve excellent results when the lens is stopped down but, as with any three-element lens, the results will be soft by today's standards at larger apertures.
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