Digital cameras have simplified the manual labour of the photographers and do their job at mere a click of a button. But, that doesn't mean you'll have perfect shots with just the help of your camera equipment. you'll feel a touch more confident with a camera in your possession, but the work of “clicking” has become specialized. Some misunderstandings about its functional aspects, and therefor...
Exposure Value (EV) numbers are how to explain exposure settings with just one number, rather than the standard f-stop and shutter speed combinations. one number represents all combinations of apertures and shutter speeds that give an equivalent exposure. For example, EV10 within the table can represent any combination of aperture and shutter speed from 4 sec at f/64 to 1/1000 sec at f/1.
Professional standard light (exposure) meters
commonly have a display of the measured light in EV numbers additionally to the f-stops and shutter speeds. The EV unit is one stop. Many professional photographers like better to think in terms of exposure values because it helps them deal with the sunshine and not the camera settings. For any given amount of sunshine, there are some ways in which the camera settings of aperture and shutter speed are often combined to supply a correct exposure in accordance with the law of reciprocity.
This states that a rise in light intensity must be matched by a corresponding decrease within the duration of the sunshine to realize the correct exposure.
it absolutely was once common for amateur mid-20th century cameras to be set using a single EV number, now only some professional camera lenses retain this facility.
The EV number is transferred from the sunshine meter to the lens, which locks the shutter speeds and apertures within the appropriate relationship, from which an appropriate pair can then be chosen.