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A large-object lens will increase clarity and is especially ideal for low-light situations. Most recreational binoculars range from 20 to 60 millimeters. For example, a pair of binoculars labeled 7 x 35 would have an object lens with a diameter of 35 millimeters. It represents the size of the object (or front) lens. The determining factor for the amount of light captured in an image, aperture (from the Latin aperire, “to open”) is the second number in the two-number code. As magnification increases, field of view generally decreases.
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Most binoculars’ magnification powers range from 7 to 10.
#Binocular buying guide code
The first number in the code represents magnification so 7 x 35 binoculars magnify images to seven times what would be seen by the naked eye.
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Magnificationīinoculars are usually labeled with a two-number code, such as 7 x 35. When manufacturers talk about “flat field,” they’re referring to a sharp, clear image across the entire field of view. Standard binoculars range from approximately 250 to 600 feet, or roughly 5 to 11 degrees. This measurement is given either in terms of linear feet viewed from 1,000 yards or in degrees of field (1 degree of field equals a view of 52-1/2 feet from 1,000 yards). The field of view is the size of the area viewed through the lens. From there you can begin to understand the optical features’ interrelationships. Knowing what the numbers mean is the first order of business when it comes to purchasing binoculars.