Lens Reviews - Telephoto ratio - Glossary

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Telephoto ratio	The ratio between the overall length of a telephoto lens and its focal length is called the telephoto ratio. Put another way, it is the value of the distance from the apex of the frontmost lens element to the focal plane divided by the focal length. For telephoto lenses, this value is less than one. For reference, the telephoto ratio of the EF 300mm f/2.8L USM is 0.91 , and that of the EF 600mm f/4L USM is 0.78.

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