Tuesday, January 27, 2015

How is Field of View determined?



Dear Eagle Optics,
Can you tell me how they figure out the feet at 1000yds on binoculars.
For example 7 X 50 equals 376 ft at 1000 yds. How do they get the 376 Feet.

Thanks, 

Conrad A.

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Hi Conrad,
Thanks for your inquiry.  The figure you are looking for is referred to as “field of view”.  This measurement can’t be calculated simply by knowing a binoculars size.  It’s possible to have 3 different binocular models all of the same size, with different specifications for field of view.  

The field of view is determined by a number of different factors based on how a particular model is designed.  Things that will influence field of view can be eye-relief, objective lens diameter, and magnification.  In general, lower power binoculars will have a wider field of view.

Like the weight of a binocular, field-of-view is one specification that you just need to find out for various makes and models.  If there is a particular model or models you would like this figure for, please give us a call.

Best regards,

Eagle Optics

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