What is the formula for calculating final magnification ?
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First, you need to find the focal length of the binoculars. Objective size -100mm is not part of the equation. On the wooden tripod astronomy model that accepts 1.25" eyepieces, it is 611mm. You then divide this focal length - the focal length of the binocular - by the focal length of the eyepiece used to determine magnification. If you have an old model, though, you may want to check with Oberwerk for sure on the focal length of your bino.
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