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But hang on, any telescope with a camera adapter is also a telephoto lens, so therefore, many of us have lenses bigger than this. The only difference I can see is that this thing is purpose built as a telephoto lens, however, Carl Zeiss only makes lenses that adapt to most camera's using an adaptor, like a telescope this thing is useless without an eyepiece (or in photography terms, a camera, both camera's and eyepieces do the same job, bring the light collected to a single pont of focus) therefore, call it a telephoto lens if you like but it is indeed a telescope or indeed a telescope is a telephoto lens.
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