What does the on binocular ratings or specs mean?
Tuesday, May 19th, 2009 at
8:20 pm
John Asked:
I have a pair that says they are 8 x 21 and field 7 but i have no idea what that binocular ratings means?
Reply:
8 refers to the power of the binocular ratings. They bring objects 8 times closer. 21 refers to the diameter of the objective lens in mm. 7 refers to the field of view in degrees. It is common currently to express field of view in feet per 1000 yards. 7 degrees is about equal to 365 ft at 1000 yards more or less. That is about average.
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 Super Astronomical Zoom Binocular Telescope 15 180X100  US $57.92
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 Galileo Astronomical Binoculars Water Resistant 20x US $95.61
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 Super Astronomical Zoom Binocular Telescope 15 180X100 US $95.88
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 DIA STONE 11x80 COATED OPTICS ASTRONOMICAL BINOCULARS US $99.00
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 NOVA 20x80 Triplet Obj Astronomical Binoculars BNew US $155.00
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 ZHUMELL20x80mm32 GIANT ASTRONOMICAL BINOCULARS US $149.00
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8 refers to the power of the binoculars. They bring objects 8 times closer. 21 refers to the diameter of the objective lens in mm. 7 refers to the field of view in degrees. It is common currently to express field of view in feet per 1000 yards. 7 degrees is about equal to 365 ft at 1000 yards more or less. That is about average.
What is this cool music?
hmm, is fixed focus better ? hmm, i dunooooooo
Thanks much!
Hi.,
I suggest that you must select the exact specifications and is affordable for you ..
More details.. http://onbinoculars.blogspot.com