焦比- 维基百科，自由的百科全书 在光學中，一個光學系統中的焦比（英语：f-number，或稱「F比例」、「相對孔徑」、「 光圈值」等，习惯上也简称「光圈」）表達鏡頭的焦距和光圈直徑大小的關係。簡單來說 ， ...
Lockheed Martin F-22 Raptor - Wikipedia, the free encyclopedia Primary contractor Lockheed Martin Aeronautics manufactures the majority of the airframe and performs final assembly at Dobbins Air Reserve Base in Marietta, Georgia; program partner Boeing Defense, Space & Security provides additional airframe components
Numerical aperture - Wikipedia, the free encyclopedia By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one ... 1.1 Numerical aperture versus f- number; 1.2 Working (effective) f-number.
F-number - Wikipedia, the free encyclopedia where N is the uncorrected f-number, NAi is the image-space numerical aperture of the lens, and |m| is the absolute ...
Exposure value - Wikipedia, the free encyclopedia The f-number (relative aperture) determines the depth of field, and the shutter speed (exposure time) ..... The equation for correcting for ISO speed is sometimes shown with a minus sign, and an online ...
Ford F-Series - Wikipedia, the free encyclopedia The Ford F-Series is a series of full-size pickup trucks from the Ford Motor Company which has been sold continuously since 1948. The most popular variant of the F-Series is the F-150. It has been the best-selling vehicle in the United States for the past
Aperture - Wikipedia, the free encyclopedia Smaller stops (larger f numbers) produce a longer depth of field, allowing objects at a wide range of distances to all be ...
Guide number - Wikipedia, the free encyclopedia The guide number is the product of the maximum flash-to-subject distance and the f-number of the aperture that will ...
Lens speed - Wikipedia, the free encyclopedia Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger ...
F-number (disambiguation) - Wikipedia, the free encyclopedia 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 ...
