In photography, lens vignetting is a reduction of an image’s brightness or saturation at the corners compared to the image center. The word vignette originally referred to a decorative border in a book. Later, the word came to be used for a photographic portrait which is clear in the center, and fades off at the edges. […]
Archive for the ‘Optical’ Category
Lens Vignetting
January 25th, 2012 
Andrei 
Posted in Optical 
Tags: lens vignetting, vignetting filter, vignetting photography 
Comments Off on Lens VignettingCamera Field of View
January 10th, 2012 Andrei The camera field of view is determined by the angle of view from the lens out to the scene and can be measured vertically or horizontally. Because the aspect ratio differs between formats, the more universal camera field of view is calculated along the diagonal of the scene. A shorter focal length (such as a […]
Posted in Optical Tags: camera field of view, photography angle Comments Off on Camera Field of ViewPerspective In Photography
January 7th, 2012 Andrei If you photograph a subject with a tele lens and want it to have the same size on the sensor when photographing it with a wide angle lens, you would have to move closer to the subject. Because this would cause the perspective to change, lenses with different focal lengths are said to have a […]
Posted in Optical Tags: perspective distortion, perspective in photography Comments Off on Perspective In PhotographyMacro
December 18th, 2011 Andrei In photographic terms, “macro” means the optical ability to produce a 1:1 or higher magnification of an object on the sensor. For instance if you photograph a aquarium shrimp with an actual size of 21.6 mm so that it fills the 35mm sensor (43.3mm diagonal), the shrimp gets magnified with a ratio of 43.3 to […]
Distortion
September 10th, 2011 Andrei Distortion is a deviation from rectilinear projection, a projection in which straight lines in a scene remain straight in an image. It is a form of optical aberration. Although distortion can be irregular or follow many patterns, the most commonly encountered distortions are radially symmetric, or approximately so, arising from the symmetry of a photographic […]
Posted in Optical Tags: barrel distortion, distortion, mustache distiortion, pincushion distortion Comments Off on Distortion
