The first full-frame fisheye lens to be mass-produced was a 16 mm lens made by Nikon in the late 1960s. Digital cameras with APS-C sized sensors require a 10.5 mm lens to get the same effect as a 16 mm lens on a camera with full-frame sensor.[3] ...
A more forgiving means to shoot over/unders is with a full-frame fisheye lens (16mm Nikkor or 15mm Canon). Recently, I have had good luck using the Nikon 12-24mm zoom on my digital SLR cameras as well.
wide-angle lenses these lenses show extreme barrel distortions - just for the effect of it. Looks interesting but nothing that should be frequently or it gets boring. The picture to the right below illustrates the effect of a full-frame fisheye lens.
See also: Fisheye lens, Lenses, Frame, Fisheye, Photograph
 
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