Controlling Light in Photography
Control of light in photography – The word “photography” comes from “phos”, which means Greek light, and “Graphis”, that is, to draw or write. If photography is defined as “the art and science of changing images on a surface sensitive to the action of light,” we see that it is not, in principle, at least a certain understanding of the nature of light and Mastery of the basic. Success as a photographer.
In Part 1 of this article, we analyze the behavior of light in relation to the portrait photographer.
Let’s begin to explore the methods used by portraits photographers to control the behavior of light artistically interpret them, alive or otherwise. There are many aspects to managing light for portrait photography.
A fundamental aspect is always exposure. The degree of sensitivity to light (photosensitivity) on the surface on which an image is to be fixed, whether film or digital, requires the required intensity and duration of exposure.
The most modern camera lens aperture is designed to allow the control of the intensity of light incident on the film (or digital image sensor). In deep words, the aperture is a hole or aperture by which all the light reflected by the object is admitted into the chamber.
The intensity of reflected light for film exposure (or image sensor) is controlled primarily by the size of the aperture.
The size of the aperture or aperture aperture is generally considered to be f / stop. F / stops may seem confusing to the first. The f / numeric stop value is a fractional aperture of the lens aperture. Therefore, a decrease of an f / stop actually causes the intensity of light to be allowed or allowed in the camera to approximately double. Therefore, an increase of an f / stop will result in the intensity of the light to medium fraction.
You can prematurely conclude that you get a proper exposure simply by adjusting the size of the aperture or aperture until the intensity of light is allowed to be fair.
However, depth of field or DOF (distance in front of and behind the subject that is in the focus) is also a useful function of the size of the aperture aperture.
In general, the depth of field or DOF increases as the aperture aperture size decreases, and vice versa.
Exposure control is also achieved by adjusting the duration of light incident on the film (or image sensor). To control the duration of exposure, most modern cameras use a shutter. The fin may be considered a metal curtain with an aperture (or slot) passing the film (or image sensor) at a time or at a pre-controlled speed.
Shutter speeds are expressed in minutes, seconds and fractions of a second.
Therefore, a shutter speed of 1 / 100th of a second allows twice the exposure time as a shutter speed of 1 / 200th. The resolution of an image is determined in part by the exposure time in the image capture.
A standard focus in portrait photography is to adjust the aperture size to give the desired depth of field, and to adjust the shutter speed to obtain an acceptable level of exposure.
The third fundamental parameter that is adjustable in controlling the exposure of an image is the film speed (or ISO / ASA number). Film speed is a quantitative description proposed by the “chemical sensitivity” of any material used in the film.
Plus ASA or ISO number, the greater the photosensitive film or the sensor is. Faster movie speeds will capture more easily from fast shooting and low light images.
However, faster film speeds also result in a higher grain or “noise” in an image with ever sharper detail. Likewise, the ISO or ASA number of the most modern digital cameras can be adjusted manually to control the sensitivity of the digital image sensor, with a similar effect.
All light is controlled from the camera by manipulating the duration and intensity of the exposure, and by selecting an appropriate film speed for the light conditions in the home or by adjusting the sensitivity of the image sensor digital.
These methods work well to control the overall or average exposure of the composition.
For a greater degree of control of the light in the photograph to improve the spectacular reflections, the impact and the softness of the shadows, it is better