17 Apr The Picture Patch Club – #3
The Picture Patch Club presents: Explaining Exposure
To achieve a perfectly bright image, every photographer must be educated on exposure. However, before explaining how to achieve the right exposure in-camera, I’ll explain what exposure actually is. In photography terms, exposure determines the amount of light that hits the camera sensor. The exposure is the measure of how dark or light the picture will be.
What is The Exposure Triangle?
To understand exposure you must grasp the three most important camera settings that make up the exposure triangle. These settings are shutter speed, aperture and ISO.
What is Shutter Speed?
The shutter speed regulates the duration in which the shutter is open for. It is measured in seconds and has a similarity with the aperture in the way that when the exposure time doubles, the amount of light entering the camera doubles.
Shutter speed is a very effective setting to use when photographing moving subject such as; an Olympic sprinter, a waterfall etc. Here is our example of how we used a fast shutter speed to capture a moving subject.
What is Aperture?
The aperture controls the amount of light that you want to enter the camera sensor. Aperture is written as f/number, therefore it’s described in forms such as f/2, f/4, f/8, and so on. Every time the number doubles the light collecting area of the sensor that the aperture controls halves. Therefore less light will be collected. If the aperture number halves the sensor will collect double the amount of light prior to the previous number. Simple enough right? If you’re confused here is a diagram to clear things up a little.
Using the aperture can be useful when trying to control the depth of field of an image.
What is ISO?
This is an interesting setting as the ISO isn’t a part of exposure. From the definition of exposure (mentioned above) ISO does not control how much light reaches the camera sensor. However, what ISO does do is that it affects how bright your image is, as well as the amount of grain there is. The rule of thumb is that the lower the ISO the better quality of image you’ll get.
A common high-quality ISO number normally ranges from 100 and upwards. Nowadays numbers above 800 ISO are acceptable. However, anything above this can cause a slight grain to the image. Nonetheless, it all depends on the quality of the camera you are using.
How do these setting relate to Exposure?
By adjusting the aperture, shutter speed and ISO in your camera settings, you’ll see changes in each of the images you take. Being able to control these three aspects is important when you want to achieve a suitable exposure. It all takes practice!
Practice controlling exposure
With all things considered, controlling exposure isn’t easy. Although it’s worth taking the time to work out the settings in order to achieve high-quality imagery.
I recommend just going out and practising all the settings in the exposure triangle with your camera.
Our premium products are great examples of how we look to implement high-quality images into our products. The studio style photography, bullet time and the vintage photo booth are great examples of this!