Eye of the eclipse...

by darkhausen

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Telephoto is technically a specific type of lens design, but usually means any lens with a long focal length and correspondingly narrow field of view.

Any telephoto lens technically must include a telephoto group of lens elements, which extend the light path to create a lens where the focal length is greater than the physical length. The Wikipedia article on telephoto lenses goes into more technical and historical depth, and explains the common usage as well.

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