Setting the ISO is really very, very simple. The only thing you need to make sure is that the mode dial is set to one of the Creative Modes. Any of the Automatic Modes and the ISO is forced to fully automatic. So, set your mode dial to P for program for example, press the ISO button right here with you index finger and use the Down or Up navigation buttons to choose the appropriate ISO for your situation.

You can either press Set or just give it a second and the ISO will be selected. ISO is very, very similar to the volume on a stereo. When you increase the ISO let’s say to 800 or 1600, you’re increasing the volume and you are making the camera more sensitive to the available light. But like when you increase the volume on a stereo, you are also increasing the noise. So typically, if I have enough light, I will choose 100 in order to maintain the cleanest image possible.

However, if I am not using the flash and I need to maintain a fast shutter speed, I will have to increase the ISO. Just remember it’s going to create a slightly more noisy or grainy image.

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