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![Aperture - Wikipedia, the free encyclopedia]()
en.wikipedia.orgThe lens aperture is usually specified as an f-number, the ratio of focal length to effective aperture diameter. A lens typically has a set of marked "f-stops" that the f-number can be set to. A lower f-number ...瀏覽：396 -
![焦比- 維基百科，自由的百科全書 - Wikipedia]()
zh.m.wikipedia.org上式中，f是焦距，而D是光圈直徑。慣例上，"f/#"是視為單一符號，書寫時數值替代 符號中的井號。舉個例子，若焦距值是光圈 ...瀏覽：826
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日期：2026-04-24
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：2026-04-22
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：2026-04-24
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：2026-04-22
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：2026-04-20
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：2026-04-20
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：2026-04-18
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：2026-04-22
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 ......
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