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 You Should Have a Pretty Accurate Idea:Binoculars In Low Light

Planning on using your Monocular Telescope in low light conditions, such as at dusk or at dawn? If so, when you buy your new binoculars you'll want to look for some specific qualifications to ensure that your vision won't be compromised. First, check the lens coating. If the binoculars are listed as fully multi-coated, this means that there are multiple layers of lens coatings on all lenses and optical pieces. This is important because the lens coating is what cuts down on glare and allows the most light possible to enter the binocular. The amount of light affects the brightness and clarity of the images you see, so during periods of low light you want to maximize the amount of light that is taken into the binoculars.

Additionally, the exit pupil is a very important indicator in how well the binoculars can function in low light. The size of the exit pupil can be determined by dividing the size of the objective lens by the magnification size, or basically the second number by the first in the specifications. For instance, a 10x50 specification would indicate an exit pupil of 5. The rule of thumb is to use an exit pupil that is the same size as the human eye. During periods of low light, the human eye's pupil expands to five to seven millimeters, to maximize the amount of light that can be collected. Thus, you'll want to choose a binocular with an exit pupil of five to seven millimeters as well.

You may see some binoculars with a twilight factor listed. This complex mathematical formula can be used along with the brightness index, or overall light transmission, to determine how well the binoculars will perform in low light periods. By also considering the lens coatings and exit pupil, you should have a pretty accurate idea of how well the binoculars will perform in low light.

Company Resource:    Waterproof Binoculars Straight Binoculars

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