Fun with Timed Exposures — OZONE Asylum, home of the Mad Scientists

Fun with Timed Exposures

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	OK, so I finally pulled together a few minutes to take some flash examples. My assistant Beaker will help me demonstrate. I've set up a situation in which my subject is backlit. Or more accurately, the background is lit and my subject is not. Taken without a flash, the camera exposes for the background and the subject is left in silhouette. [img]http://www.bigwaste.com/asylum/flash_01.jpg[/img] Next, I turn on the flash. By default, the flash and the shutter work together to emit and capture enough light to properly expose the subject. Of course, since the shutter stays open only long enough to capture the light of the flash, the background isn't properly exposed. [img]http://www.bigwaste.com/asylum/flash_02.jpg[/img] This time, I tell the camera I want to use slow-sync flash. (With my 10D, I can do this by switching to Av, or aperture-priority, mode.) The shutter opens, the flash emits enough light to illuminate the subject properly, and the shutter remains open until the background is exposed properly, as well. [img]http://www.bigwaste.com/asylum/flash_03.jpg[/img] Up until now, I've had the camera on a tripod. This time, I hand-hold the camera and use slow-sync flash as I did before. I even move the camera deliberately for effect. As before, the shutter opens, the flash illuminates the subject, and the shutter remains open to expose the background. And since the exposure time is a bit lengthy, the movement of the camera is revealed in the background's motion blur. (The same thing would happen, of course, if the camera were still and the background itself were moving. Like headlights of moving cars, for instance, or a tree blowing in the wind under a streetlight.) [img]http://www.bigwaste.com/asylum/flash_04.jpg[/img] Any questions? [url=http://www.wesleytreat.com] [img]http://www.bigwaste.com/asylum/sig_awesome_01.gif[/img] [/url] Loading...
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