Correct Vignetting

A problem that often arises in the creation of panoramic photographs from many individual shots is vignetting. This is an optical defect of camera lenses, that Create images in which the borders are darker than the center. The amount of vignetting changes from lens to lens, and is less noticeable in expensive ones.Digital cameras zoom lenses often show a high level of vignetting in wide angle position, especially at wider apertures. The same happens to most fixed wide angle lenses, but at a lower level.Vignetting is not much an issue in single photographs, since it is not easy to notice. It can become a problem when you stitch many photographs together: in the final image you can have a sky with lighter parts (at the center of an image) and darker ones (where two borders overlap).