A photographs exposure determines how light or dark your picture will appear when it has been captured by your camera
There are three things to consider when taking a picture in order to attain good exposure; aperture, shutter speed and ISO
Aperture
Control the amount of blur or sharpness around your subject
Control the amount of blur or sharpness around your subject
The aperture is the size of the hole of the lense through which light travles, and is measured in f-stops. The lower the f-stop, the more light is alowed to enter the lense, resulting in more light being captured. When the f-stop is higher less light enters. Aperture affects how blurry or sharp your photograph is. This is known as the depth of field.
Shutter Speed
Show the movement of a fast moving subject or freeze it in action
Show the movement of a fast moving subject or freeze it in action
Shutter speed (exposure time) is the length of time the shutter of the camera remains open, to expose light into the camera sensor. The longer it is open the more light is captured and the blurrier moving subjects become (motion blur) however if the shutter speed is fast it can freeze action completely.
The speed of the shutter is measured in fractions of a second ie. 1/4 is a quarter of a second and 1/250 is one two-hundred-and-fiftieth of a second or four milliseconds
The speed of the shutter is measured in fractions of a second ie. 1/4 is a quarter of a second and 1/250 is one two-hundred-and-fiftieth of a second or four milliseconds
ISO
Sense the right amount of light for the visual effect you want
Sense the right amount of light for the visual effect you want
ISO measures the sesitivity of the image sensor. The lower the number the less sensitive your camera is to light. Higher ISO pictures are often considered noisy, in the sense that they become grainy or contain discoloration when used in well lit areas. Therefore they are generally used in darker environments.
The photo effects you want to achieve with the aperture and shutter speed will impact the amount of light reaching the sensor, so you use the ISO to adjust its sensitivity and get a good exposure
The photo effects you want to achieve with the aperture and shutter speed will impact the amount of light reaching the sensor, so you use the ISO to adjust its sensitivity and get a good exposure
Here I adjusted the intensity of the lighting. The first picture is overexposed, meaning that the aperture, ISO and shutter speed were not in the right proportion. In order to get a good exposure the three components had to be adjusted
In these images we were able to create shapes with light in a dark room. This was possible because the shuter speed was set to fifteen seconds so we could freeze the light in action