This the distance that the film plane can be moved while maintaining an acceptably sharp image without the need to refocus the lens. This is important when using cameras that have a movable film plane.
Focus shift corresponding to plus or minus one-quarter wave error. By Rayleigh criterion, it is defined as: DOF = k2.l/(NA)2, where k2 is a process-dependent factor which can range from 0.5 to 0.8.
The ability of an imaging system to keep an image in focus when the object plane is NOT thin.
The distance over which the focused laser spot has a constant diameter and thus constant irradiance.
A zone of focus in the camera. If an image is focused on a ground glass screen in a camera, depth of focus makes it possible to move the screen slightly backward or forward and still have the image in acceptable focus.
The range of distance that objects are in focus. Depth of focus is directly affected by accommodation, the ability of the natural crystalline lens within the eye to change shape and thereby change focus. After around age 40 the ability to accommodate is reduced due to presbyopia and near depth of focus is limited. Depth of focus is also affected by pupil size. The smaller the pupil, the greater the depth of focus.
The range of distances between a lens and image plane (target in the pickup device) for which the image formed by the lens at a given setting is clearly focused.
The distance range over which the film could be shifted at the film plane inside the camera and still have the subject appear in sharp focus; often misused to mean depth of field.
Very narrow zone on the image side of the lens within which slight variations in the position of the film will make no appreciable difference to the focusing of the image.
The range of sensor-to-lens distance for which the image formed by the lens is clearly focused.
The Depth of focus depends upon the numerical aperture (NA) as well as the magnification and is inversely proportional to both. The higher the magnification the shorter the depth of focus for any given numerical aperture. Also known as depth of field.
The range of the distance from the sensor to the object at which the lens is focused.
The range of motion of the focus assembly which around a set focus distance which will not defocus an object at that focus distance (image space distance).
distance which the film plane can be moved while maintaining an acceptably sharp image without refocusing the lens.
the distance away from the focal plane that an image may be and still meet a given resolution specification.
Depth of focus is a lens optics concept that measures the tolerance of placement of the image plane (e.g. film plane in a camera) in relation to the lens.
