Why moving subjects are usually blurred in photos, but not always?
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It depends on the situation and the technology being used to capture the photo. Basically a photo just captures and records the photons (light) that are being reflected by the object. This capturing of photons occurs in a range of time from 1 to a fraction of a second in most instances with typical shutter speeds that you will see being 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250 and 1/500 of a second.
So, if the object is moving so fast that the film or optical computer chip receives more photons than a still image in the time the shutter is open, then you get motion blur. It is more likely to happen the longer the shutter is open. So, if your camera’s shutter speed is set to 1/500th of a second then it is essentially a single frame from a video that is at 500 frames per second and is very unlikely to get motion blur.
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