OBJECTIVE LENS SIZE (“APERTURE”) of the binocular

One would be tempted to go for big objective lenses, since the bigger the objective lens, the more light is captured, resulting in a clearer and brighter image. Bigger lenses also means that the instrument will be heavier. On the other hand, binoculars with smaller apertures are not that heavy and bulky (like in compact binoculars) but will not let in as many light as the bigger ones. An aperture of 42 mm. is very popular and will even be reasonable effective in low light conditions, but this is about the maximum you can go before weight and bulkiness come into the picture.

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