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Changing the ISO setting on your camera changes the sensitivity to light of the image sensor inside of it.
The lower number that you select the less sensitive the sensor is to light (and conversely the higher the number the more sensitive it becomes).
This is useful when you’re shooting in different lighting situations – particularly when there’s low light and you might not be able to use a flash (you’d bump up your ISO setting in this case).
The only cost of increasing ISO is that as you do it you’ll notice that the ‘noise’ or ‘grain’ in your shots also begins to increase.
You probably won’t notice this graininess on your images when lookin at them on the LCD on your camera – however when you get them back to your computer they’ll become noticeable with higher ISO settings.
Here’s an example that I’ve used previously with two images taken with exactly the same settings except for the ISO (100 on the left, 3200 on the right).
As a general rule you should choose the lowest ISO possible for smooth and grain-free shots.
Of course when photographing low light scenes there may be no other alternative so I’d suggest asking yourself some of the following questions when choosing what to set ISO at:
Keep in mind that it’s only when you shoot in a manual or semi-manual mode that you need to change ISO. When you’re in auto mode or one of your camera’s preset modes it will select the lowest one that it can for you.
Also keep in mind that if you change ISO that you will need to get in the habit of checking what setting is selected at the start of every photo shoot.
Many photographers have been disappointed at the end of a shoot to find that they’d forgotten to check what ISO setting they’d left their camera on in their last shoot. There’s nothing worse than thinking you’re shooting at an ISO of 100 only to find you forgot to switch it back from 1600.
To help with this always check your ISO setting before starting to shoot – but also try to always switch it back after a shoot.
Do you change ISO settings much in your photography or rely upon auto mode?