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The higher the twilight factor, mathematically, the better the resolution of the binoculars when observing under dim light conditions. Mathematically, 7×50 binoculars have exactly the same twilight factor as 70×5 ones, but 70×5 binoculars are useless during twilight and also in well-lit conditions as they would offer only a 0.14 mm exit pupil.
Nikon Corporation (株式会社ニコン, Kabushiki-gaisha Nikon) (UK: / ˈ n ɪ k ɒ n /, US: / ˈ n aɪ k ɒ n /; Japanese: ⓘ) is a Japanese optics and photographic equipment manufacturer.
Nikonos is the brand name of a series of 35mm format cameras specifically designed for underwater photography launched by Nikon in 1963. The early Nikonos cameras were improvements of the Calypso camera, which was an original design by Jacques-Yves Cousteau and Belgian engineer Jean de Wouters. [1]