Difference between revisions of "Choose Binoculars"
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Binoculars are essentially 2 small telescopes placed side-by-side, each consisting of a pair of lenses to bring distant objects closer and a pair of prisms in each chamber to orient the image right-side-up. Binoculars can be used for hunting, bird-watching, astronomy or watching the action at sporting events or concerts. Choosing the right pair will make all the difference in your hobby of choice. | Binoculars are essentially 2 small telescopes placed side-by-side, each consisting of a pair of lenses to bring distant objects closer and a pair of prisms in each chamber to orient the image right-side-up. Binoculars can be used for hunting, bird-watching, astronomy or watching the action at sporting events or concerts. Choosing the right pair will make all the difference in your hobby of choice. | ||
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== Steps == | == Steps == | ||
#Understand the numbers. Binoculars are referred to with 2 numbers, such as 7 x 35 or 10 x 50. The number before the "x" is the magnification factor, or power; the 7 x 35 lenses will make objects appear 7 times closer, while the 10 x 50 lenses will make objects appear 10 times closer. The second number is the diameter of the main (objective) lenses in millimeters; 7 x 35 lenses are 35 millimeters (1.38 inches) in diameter, while 10 x 50 lenses are 50 millimeters (1.97 inches) in diameter. Dividing the second number by the first yields the exit pupil value, or the diameter of the light beam that reaches your eye in millimeters. (For both example lenses, 35 divided by 7 or 50 divided by 10, is 5 millimeters.) | #Understand the numbers. Binoculars are referred to with 2 numbers, such as 7 x 35 or 10 x 50. The number before the "x" is the magnification factor, or power; the 7 x 35 lenses will make objects appear 7 times closer, while the 10 x 50 lenses will make objects appear 10 times closer. The second number is the diameter of the main (objective) lenses in millimeters; 7 x 35 lenses are 35 millimeters (1.38 inches) in diameter, while 10 x 50 lenses are 50 millimeters (1.97 inches) in diameter. Dividing the second number by the first yields the exit pupil value, or the diameter of the light beam that reaches your eye in millimeters. (For both example lenses, 35 divided by 7 or 50 divided by 10, is 5 millimeters.) | ||
