Aperture
With an aperture of f/2.8 the lens has a wider opening and lets more light in. Then with a shutter speed of 1/1000 of a second, the exposure time for the photo was very short. More light with a wide aperture and a short shutter speed makes a shallow depth of field, with the subject frozen in place.
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An aperture of f/16 gives the image a tight opening with less room for light. A shutter speed of 1/30 of a second lets the image get exposed longer. The long shutter speed and thin aperture makes a great depth of field, with the subject having slight motion blur
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Shutter Speed
When I used a long shutter speed of f/15, the image blurs all motion in the image, from both the camera and subject. This causes motion blur, which creates a blurry and messy image.
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With a short shutter speed, such as f/800, all motion in the image freezes, again both camera and subject. This image is clear and focused, a freeze motion image if you will.
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Exposure
A low, low aperture of (f/3.2) coupled with a not fast enough (1/200) shutter speed. This makes your photo incredibly light because it is overexposed. It absorbs too much light.
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A high aperture of (f/18) and a not slow enough shutter speed of (1/100), your image will be darker than usual because it is underexposed.
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If you balance out your aperture (f/9) along with a shutter speed that agrees with it (1/100), your image will have the proper levels of light intake, or correct exposure.
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