ISO
ISO denotes is how sensitive the image sensor is to the
amount of light present. The higher the ISO, the more sensitive the image sensor
and therefore the possibility to take pictures in low-light
situations.
ISO speed affects the shutter speed / aperture
combinations we can use to obtain correct exposure.
Suppose our digital camera's light meter warns us there
is not enough light to correctly expose a scene. We could use the on-board
flash, but let's suppose again it's not allowed.
We would then need to use a higher ISO. Set on "ISO
Auto" mode, Our digital camera will automatically select a higher ISO.
Otherwise, We can manually select the next higher ISO and see if the increased
sensitivity allows us to obtain a correctly exposed picture. If it does, we can
now take a correctly exposed picture.
However, all this increase in sensitivity does not come
free. There is a price to pay with our image appearing more noisy.
General Rules and tips for ISO Settings:
- Use an ISO of 100 or 200 when taking photographs outside in sunny conditions.
- If the sky is overcast or it is evening time, then use an ISO within the range of 400 to 800.
- Night time or in cases of low light you might need to set your digital camera ISO to 1600. If we don't then our photo will appear too dark if at all.
Examples of different settings of ISO
ISO Setting: 200
ISO Setting: 1600
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