Shutter Speed very briefly is how long the shutter on a camera stays open to accepting light. On DSLR and SLR cameras this means the amount of light that reaches the film or image sensor is proportional to the length of time the shutter is open. Normally shutter speed is used in conjunction with the ISO, which changes the sensitivity to light, to capture either really long images that give a blurred effect or really fast images that give clear images of something in motion with no blur. Much like you see in sports news of footballers or runners.
Or in the case above a pin wheel in motion. The shutter speed above shows that the faster speeds make the image pinwheel look still. Where as at a longer speeds show that the pinwheel is in motion and blurs depending on the most prominent colours.
I know this as I studied Photography at callington for a year.
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