Aperture
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Aperture is the size of the opening in the lens when a picture is taken. When you hit the shutter release button of your camera a hole opens up that allows your cameras image sensor to catch a glimpse of the scene you’re wanting to capture. The aperture that you set impacts the size of that hole. The larger the hole the more light that gets in – the smaller the hole the less light.
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This photo I have taken using a semi-slow shutter speed. I captured a photo of a ball and the movement of the ball is blurred out showing that it is a slow shutter speed. Slow shutter speeds are good for stationary objects that you wish to catch in a high quality, any picture taken of a moving object with as slow shutter speed will be blurred but could be used for a good effect. If I would of taken this photo with a faster shutter speed the ball would be clearer, fast shutter speeds are always used to capture photos of moving cars and athletes. The photo would be much better if the ball was in focus.