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In photography and optics, vignetting refers to a reduction in image brightness in the image periphery compared to the image center.

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"The word vignetting is used to indicate an unintended darkening of the image corners in a photographic image. 

There are three different mechanisms which may be responsible. Natural and optical vignetting are inherent to each lens design, while mechanical vignetting is due to the use of improper attachments to the lens. 

Natural and optical vignetting lead to a gradual transition from a brighter image center to darker corners. At large apertures both phenomena are present and the combined effect is often designated by the term 'illumination falloff'. 

Mechanical vignetting can also give rise to gradual falloff, although the usual connotation is one where it causes an abrupt transition with entirely black image corners."¹

A picture’s worth a thousand words, so here it is:

An example of vignetting in a photograph

Vignetting Reducer will reduce vignetting to a minimum by performing some computer magic. Interested? Jump to Help section.  Marek Jabłoński vignetting digiscoping digital photography SLR camera olympus nikon astrophotography astronomy telescope software

¹Paul van Walree's website about optics

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