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日期:2024-06-01
The Lockheed Martin F-22 Raptor is a single-seat, twin-engine, all weather stealth tactical fighter aircraft developed for the United States Air Force (USAF). The result of the USAF's Advanced Tactical Fighter program, the aircraft was designed primarily ...
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日期:2024-05-30
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative
aperture) of an optical system is the ratio of ......
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日期:2024-06-01
1.1 Numerical aperture versus f-number; 1.2 Working (effective) f-number. 2
Laser physics; 3 Fiber optics; 4 See also ......
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日期:2024-05-31
Smaller stops (larger f numbers) produce a longer depth of field, allowing objects
at a wide range of distances to all be ......
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日期:2024-06-02
Lens speed refers to the maximum aperture diameter, or minimum f-number, of a
photographic lens. A lens with a larger ......
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日期:2024-06-03
In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the
recurrence relation. F_n = F_{n-1} + ......
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日期:2024-06-06
The guide number is the product of the maximum flash-to-subject distance and
the f-number of the aperture that will ......
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日期:2024-06-03
F-number or F number may refer to: f-number, the ratio of the lens's focal length to
the diameter of the entrance pupil ......