Defocus aberration - Wikipedia In optics, defocus is the aberration in which an image is simply out of focus This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars
What Is Defocus? Definition, Clinical Use SHORT READS Defocus is an optical condition in which light from an object does not come to a sharp focus on the retina or image plane Instead of forming a point, light spreads out into a blur circle, so details look soft
Explanation of defocus from Field Guide to Optical Lithography - SPIE By viewing the actual wavefront as having an error in curvature relative to the desired wavefront (i e , the one that focuses on the wafer), we can quantify the effect of defocus The distance between wavefronts is called the optical path difference (OPD)
Defocus aberration - Telescope Optics In everyday's jargon, " defocus " has somewhat different meaning: it is simply an axial deviation from best focus location, correctable by mere refocusing