For the next three weeks I will be discussing the “exposure triangle.” The exposure triangle has, yep you guessed it, three parts. The three parts are aperture, shutter speed, and ISO. This week I will explain aperture.
The aperture determines the amount of light received by the image sensor. It also affects the depth of field, but we will discuss that some other time.
The definition of aperture according to google is “a space through which light passes in an optical or photographic instrument, especially the variable opening by which light enters a camera.” Basically, you can control how much light enters your camera by selecting the size of the opening that allows light in.
The aperture size can be a bit confusing because it seems a little backwards. The smaller the number, f/1.4 for example, the bigger the opening, and the more light allowed to hit the image sensor. The bigger the number, f/16 per say, the smaller the opening, and less light allowed to enter the camera.
Adjustments to the aperture need to be made based on your specific lighting condition. If you are photographing a subject inside, in a poorly lit room, you would want your aperture to be bigger (smaller number) to allow more light to hit the sensor. If you are outside in the bright sunlight, your aperture would need to be smaller (bigger number) so that you image won’t be over exposed.
In the next 2 weeks we will discuss shutter speed and ISO, so don’t forget to stop by.