The Audubon Guide to Binoculars | Audubon
https://www.audubon.org/gear/binocular-guide
WEBMost birders prefer 7- or 8-power binoculars because they’re bright and have a wide field of view, making it easier to find birds and to follow them in flight. Optics with objective lenses—the glass at the fat end of the tube—larger than 42 mm are heavier, and those smaller than 30 mm, while lightweight, aren’t bright enough to show ...
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