This One Image Explains How Aperture, Shutter Speed and ISO Work in Photography

This explains everything.
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If you are just starting out in the world of photography, mastering some of the functions you have on your DSLR camera can be tricky, but thanks to Daniel Peters at Fotoblog Hamburg you will easily have Aperture, Shutter Speed and ISO mastered as this chart shows you exactly what happens when you play around with your DSLR's settings.

ISO controls the cameras sensitivity to light. The aperture also controls how much light is let in by adjusting the inner workings of the lens and shutter speed controls how long your shutter remains open when taking a photo. Master all three of these using this chart and your're guranteed to start taking some pretty good photos. You can download the chart here.