How to calculate magnification (power) of a telescope or spotting scope?Identify the focal length of the scope. This is often marked on the body of the scope or it should be given in the user manual. For example, the Nipon 26-78x78 scope's focal length is 780mm.Find the focal length of the eyepiece.For example,for the PL16, PL26 and PL32 eyepieces as listed ineBay ShopNipon Scopes
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