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Digital Photography (Read 3534 times)
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Digital Photography
12/02/15 at 14:56:31
What is Aperture in Digital photography?

Tony Lendrum Photoshoot
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Curious Apprentice

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Re: Digital Photography
Reply #1 - 01/11/16 at 11:50:25
Behind the glass lens of all cameras, there is a hole through which the light passes, similar to a human eye- this hole is adjustable and can be opened wider or tightened smaller. The size of this hole is the aperture.

The reason for the aperture (sometimes called an f-stop) is to control the amount of light that enters the camera through the hole and hits the film (in traditional film photography) or the senor (in digital) that converts the image to digital code.
The higher the f-stop #, the smaller the hole. f/8 is a smaller hole than f/2.

If the hole is smaller, less light enters the camera. If the hole is larger more light. If there isn't much light around you, then you might want more light to enter the camera so you can get a picture.
If it's too bright around you, then you might want to lessen the amount of light entering the camera, hence the hole might be smaller, so your image doesn't get blown out.
When your camera is set to auto, the camera does this for you automatically when focusing.

Photographers use this combined with the shutter speed- that is, how long the hole is open and the light enters- in order to control precisely how much light comes into the camera to make the image.
The shutter speed combined with the aperture also effect the depth of field, or how much of the image will be in focus, whether only the things in the forefront are in focus with everything behind it blurred, or if things behind the subject in the far distance are still in focus.

Aperture can be used for various artistic effects, if you understand how it works, so it could have the potential to make your photos better, but this is subjective and depends on what kind of photography you are undertaking.
If you want your photos to be as clear and true to real-life as possible, in a documentary sort of way, you may want to use precisely the correct aperture. If you are interested in manipulating your images in artistic ways, you may want to purposely experiment with your aperture for effect.
Used along with shutter speed to manipulate depth of field, it is sometimes used to create an image where only a close-up of the subject is in focus while the entire background around that subject is blurred, for the purpose of drawing exclusive attention to the main subject of the image, without any of the background distracting the viewer.

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