In digital photography there are three basic elements which you can control- aperture, shutter speed and ISO. Aperture is the control of how much light is allowed into the camera, shutter speed is how long the camera takes the picture for and ISO is the control of the light sensitivity.
ISO levels on a digital camera should usually be around 100-400. The higher the ISO setting, the more light sensitive the camera is going to be. If the ISO setting on a camera is very high it can often result in photos appearing grainy.
The shutter speed on a camera controls how much movement there is in a photo. If there is a really low shutter speed then it results in a photo with a lot of movement. Whereas if there is a high shutter speed there will be less.
The shutter speed on a camera also manages the amount of light that gets to the sensor, by controlling how long the shutter is open.
The key to getting the right exposure on a photograph is by balancing the f-stop and shutter speed settings with the ISO.
I had a go at taking pictures alterning the shutter speed and the ISO levels.
Fast shutter speed:
Slow shutter speed:
Indoor ISO photos:
Outdoor ISO photos:
As you can see in both the pictures I took inside and outside, the higher I put the ISO settings, the brighter the subject and the picture became.
Ellie Bagshaw Photography Journalism 