Understanding ISO

           100 

        

                                                                              200   

       400

         800

         1600

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Photo:                             ISO:                                 Aperture:                           Shutter Speed:

Low ISO:                       100                                      f/3.5                                       1"3

1                                     200                                      f/4.0                                       0"8

2                                     400                                      f/4.5                                       0"5

3                                     800                                      f/5.0                                       0"3

High ISO:                      1600                                     f/5.6                                      1/5
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Questions:

What is ISO?
ISO is the measure of a digital camera sensor's sensitivity.

How does ISO work in the camera (technically)?
ISO controls the light of the photo. ISO is set manually, and is usually shot around 800.

How does ISO work in the photo?
All of the photos I used for this blog post are balanced photos. The ISO controls the pixels in the shot up close, pretty much. At a shot with a high ISO, the photo will come out grainy and pixelated (better seen when examined close up). A shot with a low ISO will be much more clear up close.

How does ISO relate to the exposure triangle?
When ISO and Aperture increase at a steady rate, the shutter speed decreases.