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Indicates how good binoculars are in low light. To find this divide the
objective lens by the magnification and square the result. A 10x40 has a
relative brightness of 16 (40/10= 4, 4x4=16). A higher number means the
binoculars will be better in low light situations.
Related Terms
An indication of the brightness value of binoculars. It's similar to relative brightness, but you multiply the objective lens with the magnification and then find the square root of the resulting number. A higher number indicates the binoculars will be better for use in low light.
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