ISO

What is ISO?

On a film camera, ISO is the 'speed'of the film. The higher the ISO, the better the image will be if the lighting is low. 

On a digital camera, the ISO shows the sensitivity to light. The higher the number, the less light is needed to take a photo. 
When using ISO 50 or ISO 100,it is ideal that there is a lot of bright light. When there is a low light, shutter speed can be made slower to allow more light into the lens, however the images can be blurry. So increasing the ISO will allow the shutter speed to be at a chosen speed depending on what the subject is. 


Which ISO speed to use?

Using the Auto ISO setting will allow the camera to determine the setting suitable for the light conditions.

Manual ISO allows you to choose your own ISO number:

ISO 50-100 > Suitable for bright days

ISO 200   > Suitable for cloudy days

ISO 400-800 > When the lighting is low but not dark

ISO 1600+  > For indoor shooting or night shots,this can also be used for 'action shots'.