ISO

ISO is the cameras sensitivity to light.

The ISO and the White Balance should always be set before a photo shoot. White Balance corrects the colors.

The Higher the ISO is, the more light can be squeezed in, especially when its dark. If in a bright situation a lower ISO would be used. 400 ISO is the ISO number which can be used for everyday.

LOWER ISO - LESS SENSITIVE - BETTER QUALITY - EVEN COLORS - EVEN TONE

HIGHER ISO - MORE SENSITIVE - BAD QUALITY - NO FINE OUTLINES - MORE GRAINY 

ISO is usually measured in a base of 100 and typically doubles each time - 100 200 400 800 1600 3200 6400

                                                                                  This image shows an ISO of a high number, 1600.

the quality of the photograph isn't as fine as the one below. There is also no fine outlines and good focus of the image.

  This image shows an ISO of a low number, the ISO was set to about 400. Where in this image you can see that it a greater quality and has fine details around the photo frames. also good shadows have been produced by using a lower number.

ISO of 800