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Optics by the numbers

April 14, 2012
By Scott C. Shalaway , The Post-Journal

The spring migration of birds is a good time to buy or upgrade binoculars. That's why I wrote a brief primer on binoculars about a year ago. I explained, for example, that every pair of binocular is described by two numbers, which are usually found on the center focus wheel.

 
 

 

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