I wasn’t present at the seminar where we looked at ISO and shutter speeds, this was due to prior personal arrangements. However, as I have previously studied photography it was reasonably simple to get my head around when looking at the presentation that was put together for us on the internet.
The ISO setting effectively controls the light sensitivity of a modern camera. The higher the number the more sensitive the camera is, and the brighter the image will be. These settings are important to note in different light conditions, such as being outside with low light or inside with bright light.
The ISO setting will also affect the quality of the image, the higher the ISO the more distorted the image will be, also known as ‘noise’ in the image. This can be seen in the image below, along with the different effects that shutter speed and aperture have on images.
The shutter speed also affects the amount of light that enters the camera, doing so by controlling the time that the shutter, or aperture, is open. Using different shutter speeds along with F-Stops and ISO’s alters how the camera records the image, this allows for lots more creativity than using the automatic setting which adjusts settings for you.
A slower shutter speed allows you to capture movement, whereas a faster one will allow for action shots. Shutter speeds can be used to create amazing results, long exposure photography is one of my favourite examples. Artists like Michael Bosanko use slow shutter speeds to create amazing light graffiti (click the hyperlink to see). Long exposure can also be used without the need of artificial light, creating incredibly beautiful shots of natural phenomena.
The ‘Exposure Triangle’ in the presentation, which is shown below, shows how to adjust your camera settings to correctly balance them in order to achieve the results you want.