camerapedia
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This site is a free-content encyclopedia of camera information, a repository of information about all still camera brands and models. By contributing, you can share your knowledge of camera equipment with everyone.
Camerapedia.org
Fogging Certain cameras or lenses may exhibit some fogging, or image areas with extra exposure (for example, a bright central spot seen with many Canon lenses). This may be due to light scattered from inner surfaces of the lens, or to some peculiarities of anti-reflective lens coating which was not really designed for infrared.