About the digital camera aperture-common basic knowledge of digital camera

About the digital camera aperture-common basic knowledge of digital camera

In the camera lens has a group of overlap metal leaf blade, its encirclesthe aperture size and the opening time had decided one time becomes exposure quantity, also has produced camera's aperture and the speed.nikon en-el1 battery

The aperture is one uses for to control the optical fiber to penetrate the lens, enters the fuselage inner sense refacing the light quantity installment, it usually is in the lens. We usually said aperture value F2.8, F8, F16 and so on are the aperture "the coefficient", is the relative aperture, by no means the aperture physical aperture, to is photosensitive the component (film either CCD or CMOS) the distance concerns with the aperture physical aperture and the lens.

Expresses the aperture size we are with F the value. The aperture F value = lens' focal distance/lens caliber's diameter, may know from the above formula must achieve the same aperture F value, the long focus lens' caliber must be bigger than the short-focus mirror head's caliber. The complete aperture value series is as follows: F1, F1.4, F2, F2.8, F4, F5.6, F8, F11, F16, F22, F32, F44, F64.

As soon as what here is worth writing is the aperture F value is smaller, enters the light quantity in the identical unit interval/unit time to be then more, moreover on first-level entered the light quantity just was under a first-level time, for example the aperture adjusted from F8 to F5.6, entered the light quantity to be then many a time, we also said that the aperture opened in a big way first-level. The most non-specialized digital camera lens' focal distance is short, the physical caliber is very small, when F8 the aperture physical aperture had been very already small, will continue to reduce will have the diffraction and so on optical phenomenon, will affect the image formation. Therefore general non-specialized digital camera's smallest aperture in F8 to F11, but the specialty digital camera photosensitive component area is big, the lens distance is photosensitive the component to be away from far, the aperture value may be very small. Speaking of the expense digital camera, the aperture F value is situated between F2.8 F16 frequently. In addition many digital cameras when orificing, may make 1/3 level of adjustment.

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