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Telephoto lens

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5200mm Canon Lens World's MOST powerful Super telephoto EF FD (updated upload)

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The Best Telephoto Zoom Lens for Canon APS-C?

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How to Use a Telephoto Zoom Lens

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Knowing the physics of your lens - Camera Basics

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Are CHEAP Lenses GOOD? Ultimaxx 52mm Telephoto Lens Review

In photography and cinematography, a telephoto lens is a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length. This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus lens in a much shorter overall design. The angle of view and other effects of long-focus lenses are the same for telephoto lenses of the same specified focal length. Long-focal-length lenses are often informally referred to as telephoto lenses although this is technically incorrect: a telephoto lens specifically incorporates the telephoto group.
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