The gradual reduction of image illuminance with an increasing off-axis angle, resulting from limitations of the clear apertures of elements within an optical system.
An unintentional, shaded loss of the edges of an image or picture by an optical component clipping the peripheral beams can lead to loss of contrast in video.
A fall-off in brightness at the edges of an image, slide, or print.
Fall-off in illumination at the edges of an image. This can be caused by poor lens design, using a hood not matched to the lens, or using too many filters at the same time.
A flaw in scopes where the edges of the view are darker than the center. This can be caused by excessively long or improper scope shades, or just bad design.
Darkening of image edges.
This is the underexposure of image corners intentionally produced by shading or accidentally created by unsuitable equipment, such as inappropriate lens hood or a badly designed lens.
Use of a field stop in a position which will cut off the light at the edges to provide a better image.
Vignetting is a darkening of the corners of an image, usually caused by light falling off toward the edge of the CCD chip due to the optical system. Typically vignetting is seen most prominently in fast-focal-ratio and wide-angle systems such as camera lenses. Vignetting is usually removed by using a flat field.
Fall-off of light illumination observed at the image corners. When gradual, it is likely to be inherent to the optical system. In the case of eclipse, it might be caused by mechanical factors such as housing. (Port hole effect as when a 1/2" lens is viewed on a 1" camera is a result of smaller image circle of the lens as opposed to the size of the imager).
An optical problem where an image is missing its edges. This is cause by the eye or camera not being properly aligned with the focal plane. Its effects sometimes appear as tunnel vision. Common causes would be: 1) With binoculars, if the distance between the eyepieces are not properly adjusted for the observers eyes. 2) With binoculars and telescopes, if the eye or camera is too close to the lens. (i.e. Too close for the Eye Relief). 3) With Afocal photography, this is a common problem if the lens of the camera is not aligned to the eyepiece, or if the eyepiece is unsuitable for the camera lens and telescope.
Optically or mechanically fading out a picture's edges. A vignette effect is especially impressive for pictures taken with a wide-angle lens. To avoid light borders, remove or fade the shadowed elements. Mechanical vignetting results from an improper attachment of the lens.
The partial masking, or blocking, of peripheral light rays either by intent, or by accident. In theatrical projection, the blockage of peripheral light rays in a projection lens due to a lens barrel that is too long, or to a lamphouse optical system that is not correctly matched to the limiting aperture of the projection lens. In photography, the intentional masking of peripheral light rays to soften and enhance a photograph.
A darkening or diffusing of the edges of an image often caused by a lens shade that is too small.
The unwanted shading or darkening of the corners of an image. Usually caused by objects mounted on the front of the lens penetrating the lens' angle of view. Common causes are a mismatched lens hood or using too many filters on the lens.
The gradual fading of a colour.
The gradual reduction of image illuminance as the field size increases. Vignetting results from limitations of the clear apertures of the elements within the optical system.
Less illumination at the edges of an image. Poor lens quality can be a cause, as well as using the wrong hood for the lens.
Is a printing technique where the edges of the picture are gradually faded out to black or white. It also refers to a fall off in illumination at the edges of an image, such as may be caused by a lens hood or similar attachment partially blocking the field of view of the lens.
uneven or reduced illumination over the image plane in a telescope or camera, causing distortion such as dimming near the edge of an image
The loss of radiation intensity due to the blocking of a portion of the beam bundle between the focused point on the object plane and the focused point on the image plane.
(DOD, NATO) A method of producing a band of color or tone on a map or chart, the density of which is reduced uniformly from edge to edge.
(Vision Sensing) A gradual darkening around the periphery of an image. Optical vignetting often occurs when the lens is too small for the imager.
In photography and optics, vignetting refers to a reduction in image brightness in the image periphery compared to the image center.