Vignetting

Example of vignetting produced by Holga camera image by Voxphoto (Image rights)

Vignetting or corner shading is an optical effect where illumination falls off towards the periphery of the image. In severe cases, the image may approach a circle in shape. The cause can be a lens with insufficient coverage for the image format, or an obstruction to the lens, such as a too-small lens hood. It may also be done deliberately for effect - either by using a cut mask in front of the lens, or using image-processing software.

Glossary Terms