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Thursday 19 December, 2013 | RSS Feed

Effective diameter of the objective lens

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If you’re looking for a pair of binoculars, besides the magnification, the objective lens would be a key factor when you choosing you binoculars. But, what’s the effective diameter of the objective lens for different use with your binoculars? The effective diameter is the inside diameter of the objective lens frame. With the binoculars designed with a numerical formula 8x42 7°, 42mm is the effective diameter of the objective lens. Given the same magnification, the larger the objective diameter, the greater the light-collecting power. This results in higher resolution and a brighter image. However, large-diameter objective lenses make binoculars bigger and heavier. Binoculars are classified according to the effective objective lens diameter as follows. Effective diameter Below 25mm:Compact-type binoculars 30 - 49mm:Standard binoculars Over 50mm:For astronomical observation and business use





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