How to calculate magnification (power) of a Nipon scope?
1. 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 26-78×78 scope’s focal length is 780mm. 2. Find the focal length of the eyepiece. For example, for the PL16, PL26 and PL32 eyepieces as listed at nipon-scope.com, their focal lengths are 16mm, 26mm and 32mm, respectively. 3. Divide the focal length of the scope by the focal length of the eyepiece to get the magnification of the scope. For example, if you wish to use a 16mm eyepiece to replace the 26-78x zoom eyepiece of the above Nipon scope, the magnification of the scope will become: 780/16=49x. It is desirable to have a range of eyepieces with different focal lengths to allow viewing over a range of magnification levels. Please keep in mind that, as a fundamental law of optics, at higher magnification powers an image will always become dimmer and less sharp. With every doubling of magnification you lose about half the image brightn
