数码摄影入门必备常识（Essential knowledge of digital photography）.docVIP

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数码摄影入门必备常识（Essential knowledge of digital photography）.doc

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数码摄影入门必备常识（Essential knowledge of digital photography）

数码摄影入门必备常识（Essential knowledge of digital photography） 1. In the cameras parameter list, what do you mean by F2.8-4/ or even F3.5 - F5 / F7.6 - F11? Answer: the F value of the camera lens aperture is not only a problem of aperture, but the actual amount of light is expressed. It is also related to the focal length of the lens. It is a relative value. For a general zoom lens, even though the apertures physical aperture is constant and the focal length becomes longer, the amount of light will be smaller and the aperture F will be smaller. F3.5 - F5 / F7.6 - F11 said: the maximum aperture at the wide-angle end, the short focal length is F2.8, in the long end of the zoom, the longest focal length is F5; the minimum aperture at the wide-angle end, the short focal length is F7.6, in the long end of the zoom, the longest focal length is F11. Of course, the advanced professional lens has a constant aperture, that is, the F value does not change with the focal length. In fact, when the zoom is in, the physical diameter of the iris changes accordingly. A lens with a constant aperture is much more expensive than a lens of the same quality. 2, why the digital cameras smallest aperture is not small enough, such as C-700 is F8, N995 is F10, and the traditional camera at any time F11, F16 or even F22 why? Answer: we usually say F2.8, F8, F16 aperture, aperture coefficient, relative aperture, aperture and aperture is not physical, physical aperture and lens aperture to the photosensitive device (film or CCD or CMOS) is related to the distance. When the aperture aperture is constant, the centre of a lens and a photosensitive device distance farther, the F number is small, on the contrary, the centre of a lens and a photosensitive device nearer, through the light hole to the optical density of photoreceptors is higher, the greater the number of F. Most non professional digital camera lenses have short focal length and very small physical aperture. When F8, the aperture of the apertur