by A camera captures a photograph in a fraction of a second, but many creative opportunities open up when you manually control the shutter speed. Getting luscious photos of star trails, for example, requires keeping the shutter open for longer than most camera controls allow. To get that shot, you need to switch to Bulb mode and use a manual-release cable to open and close the shutter with the help of a newfangled technology called “your thumb.”
Of course, we’re talking about photography, so there are plenty of devices and gadgets that give you this and many other options. An intervalometer, for example, fires the camera’s shutter at a steady rate over a period of time.
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