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Also known as a reverse or inverted telephoto, this lens design has a
diverging lens element positioned in front of the aperture and a converging
element positioned at the rear. This makes the distance from the rear of the
lens to the focal plane longer than the lens focal length. Retrofocus design has
been adopted in wide-angle lenses so the rear of the lens does not impede the
movement of an SLR camera's reflex mirror.
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