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Old Monday 1st August 2016, 18:36   #4
DanC.Licks
AKA Daniel Bradley
 
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Join Date: Jul 2012
Location: Austria
Posts: 1,721
And this
https://en.wikipedia.org/wiki/Telephoto_lens
the key phrase is "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."
So the 75-300 is a "modern telephoto zoom" and the scopes are non-telephoto lenses, and thus behave differently.
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