Expoure

Expoure essentially the amount of light coming from the camera aperture and the film or sensor used to select the shutter speed. The effect depends on the sensitivity of the ISO (sensitivity), the film or sensor used. Light will be selected based on a combination of aperture, shutter speed and sensitivity, known as the exposure or "exposure value" (EV).


A value of 0 (zero) or EV is based on a combination of aperture (diaphragm) to f/1.0, Exposure (shutter speed) at a rate of 1 second (1 sec) and the sensitivity at ISO 100, it must be installed. Note that the sensitivity will be used for technical computing world, or "power" (LV), but for simplicity and to show that the sensitivity (ISO), which affect the calculation. contact or exposure value (EV), ISO is taken into account in this description.

So, if a customer reduces the amount of light on film or sensor. (For example, by increasing the shutter speed or aperture menamabah) will increase the visibility of EV, such as, for example, 1/125s shutter speed and apreture at F / 4 and 6 EV, if we change the shutter speed is 1. / 250s with an aperture of F / 4, the impression that we will be 7 EV. Similarly, if we stay in 1/125s shutter speed and aperture of F / 4 f. / 5,6 Ker, please visit the original calculator to try to train.

EV value is often used in high ambient light in the daytime, so we have the least amount of light to avoid the sun.