Tuesday, December 13, 2011
Solutions: Time-Lapse Quicktips
How to make a movie that will show the world differently
Time-lapse photography and videos have exploded in popularity. During the recent Sony Art of Expression contest hosted by OP, several of the finalists in the video category were time-lapse videos. It's easy to see why time-lapse is so hot—the effect is positively mesmerizing. Whether you're shooting clouds moving over a mountaintop or a busy street crossing, time-lapse gives you a unique look at the world. It even makes watching the grass grow interesting.
Fundamentally, a time-lapse video is a series of still images seen in fast sequence. Video typically gets played at 24 frames per second. If each of those frames is captured at around 1⁄30 sec., one capture immediately following the last, they play back looking like the normal passage of time. The capture-to-playback rate is about 1:1. This, more or less, is how movie cameras work. If, on the other hand, each of those exposures is made a minute apart and played back at 24 frames per second, the capture-to-playback rate is 1440:1. Every 24 minutes you create one second of playback. When you play the video, you're seeing the world sped up dramatically. That's all a time-lapse is.
To do it, you need a few essential tools. A sturdy tripod with a good head is critical. Once you start shooting, you need the camera to stay perfectly still (we'll cover how to make a moving time-lapse in a future issue of OP). Some DSLRs have built-in intervalometers, which let you program the camera directly. If your camera doesn't have the intervalometer built in, you'll need an accessory intervalometer. Most Nikons have intervalometers while Canon models require an accessory unit. Either way, they're easy to set and use. A capable image-processing program and software to compile the still frames are also requirements.
1 Set up your camera and tripod and find a suitable subject. Moving clouds always make for interesting time-lapse. Shooting the night sky is another good choice, but it's a bit more complicated, so we'll focus on daytime shooting here.
2 Once you're set up, you need to program the intervalometer. First, decide how long you want your movie to be. Multiply 24 frames per second by the number of seconds to get the overall number of frames you need. For example, a 15-second time-lapse requires 360 frames (24 x 15 = 360). Most experienced time-lapse shooters suggest that you "drag the shutter," meaning set a shutter speed that's on the slow side so elements moving through the frame will streak instead of blip in and out of existence; 1⁄15 sec. usually works well.
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