Getting a good photo, conveying all the nuances of light, according to the real characteristics of the object being shot, visible to the human eye, is the dream of any photographer or operator. The transfer of the required amount of light for recording a high-quality image depends on the exposure.
Instructions
Step 1
Exposure in photography is a quantitative indicator of the effect of light on the photosensitive layer of a matrix or photographic film. This value is equal to the product of the luminous flux (illumination) falling on the surface to be treated by the time interval during which the light acts on it. The exposure is measured in "lux-per-second" - lux * s.
Step 2
Technically, instead of the concept of "exposure", the term "expo-par" is often used. Expo is a combination of two parameters, shutter speed and aperture. Exposure is the time interval during which light affects the photosensitive layer of the matrix or emulsion of photographic film. The shutter speed is "responsible" for the shutter speed, which, after a certain time, blocks the luminous flux.
Step 3
The diaphragm (from the Greek "partition") is an optical device in the structure of the lens, which allows you to adjust the amount of transmitted light, namely to control the correspondence of the brightness of the photographic image and the object being shot. In addition, the aperture can be used to control the depth of field when taking pictures.
Step 4
Getting the correct exposure meter for a particular shot is called “metering”. In amateur cameras, this process is usually automated. In professional cameras, this is a switchable function. Exposure metering takes into account the sensitivity of the film (matrix), contrast, distance to the subject, etc.
Step 5
In professional photography, "exposure compensation" is often used. This is a manual change (shift) of exposure pair. This technique is used if the results of the current exposure metering do not allow you to accurately convey the light range of the photo, for example, the subject has sharp transitions from bright light to deep shadow, as when shooting a dark forest against a bright blue sky. Also, exposure compensation is applied when shooting against a light source (sun, bright lamp) or against the background of sunrise / sunset.
