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Blur in a photograph can be good or bad, depending on whether it's there on purpose or not.

Usually, a photograph is blurred when either the photographer or the subject moves while the camera is still recording the picture.

If the photographer moves (sometimes the camera moves slightly when you press the shutter release button), the blur that results is said to be from "camera shake." Modern cameras have some form of image stabilization to counteract camera shake and therefore reduce or eliminate blur.

If the subject is moving, the only way to freeze that motion is by using a fast enough shutter speed. A shutter speed of 1/125 sec. may be enough to capture a child running around but you may need a shutter speed of 1/2000 sec. to freeze the motion of a race car.

However, blur can also be good and photographers will use a shallow depth of field to introduce blur into their pictures. Why? To isolate the main subject from a distracting background. This technique is very effective when taking portraits.

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15y ago

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