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The radar beam. hits oncoming cars, and is reï¬ected back. to the radar unit, which can calculate. speeds from those reï¬ections. Radar can be used from a police car. thatâs either stationary or moving, since. it does not require precise aiming to. clock traï¬c speeds. There are also hand-. held units that can be operated from a. car, motorcycle, or an oï¬cer standing at. the side of the road.
Many sports use very fast shutter speeds to capture the peak moment and freeze it in time. If the subject of your photo is not moving, or you want to show the passage of time (with a running river or waterfall), then you can use a slower shutter speed.hutter speed is measured in fractions of seconds and seconds. Here is an example of shutter speed numbers, from fast to slow: 1/2000 1/1500 1/1000 1/750 1/500 1/350 1/250 1/180 1/125 1/90 1/60 1/45 1/30. Realize that 1/2000 of a second is incredibly fast and is not a shutter speed that you will typically use.