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What is the formula for calculating final magnification ?

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What is the formula for calculating final magnification ?

Postby IbeDavid on Thu Jan 20, 2011 6:55 pm

Im getting back into using my older model Oberwerk Giant Binoculars , after some time out of the hobby, which has removable focal lenses . I cant remember how to calculate the final magnification using the different focal lenses that i have (the exit end of the Binos are 100 mm) . Can someone enlighten me please ? Thanks.
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Re: What is the formula for calculating final magnification ?

Postby Jne_K on Fri Jan 21, 2011 1:51 pm

Hi

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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