Wednesday, August 1, 2012

The Ethnic Fest

Nikon D3000, 26mm (18-55mm), f/6.3, shutter 1/8, ISO 200

The Wyandotte County Ethnic Festival is an event full of energy and motion. Video cameras have no trouble capturing motion, but still photographers have to be a bit more clever about it.

One of our two options is motion blur. Allowing the subject to move during the exposure creates a blurry, streaky image the viewer will read as motion. The key is shutter speed. The shutter must remain open long enough for the subject to move.

In this example, a group of dancers are making their way to the stage. I’ve got the ISO set at 200, which is a little low for most indoor lighting situations. As a result, the shutter needs to stay open for a long time (1/8 of a second) in order to get enough light for a good exposure. The dancers moved a fair amount while the shutter was open, resulting in a nice motion blur effect.

But motion blur can be tricky. You only want blur on moving subjects, not the picture as a whole. The subjects can move, but the camera can’t. If your hands move at all (even as much as the pressure of your finger on the trigger) while shutter is open, it will blur your entire image and make it look terrible.

In this example (shot just a second or two before the good one above), the camera moved just a teeny bit, wrecking the image quality.

Nikon D3000, 26mm (18-55mm), f/6.3, shutter 1/8, ISO 200

Thus to pull off motion blur you will generally want a tripod, monopod or something else to brace your camera.

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