What does it mean?
When using a camera with manual controls, you have the option to set the aperture. This allows you to determine how much light to allow into your camera, which affects the overall exposure and how deeply focused your picture will be. Setting the aperture on your camera can give your pictures a variety of looks by blurring out the background or keeping it sharp. It also helps determine how bright or dark your pictures will be. Aperture is one of the components of photographic exposure.
How to use it
1.Determine if your camera can have the aperture set. SLR (Single Lens Reflex) cameras and some feature heavy compact digital cameras allow you to set the aperture. Look for a command dial on your camera. If it is labeled with an "Av" or "A," it has the ability to set the aperture manually. Some compact digital cameras hide this feature in a menu system.
3. Adjust the aperture on your camera. Use your camera manual to determine where the aperture setting is on your specific model and brand of camera. Toggle through the numbers, remembering that the lower number will allow more light into the camera. If you are shooting in the fully manual ("M") mode, your shutter speed will stay constant as your set your aperture to different values. Take a few pictures with different aperture values to see how the different settings affect your picture.
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