The key is to choose a shutter speed that's slow enough to blur the stationary part of the scene, yet fast enough to allow you to sharply capture the subject itself. As an example, in the photo above, the train was moving at about 60 mph from left to right. I chose a shutter speed of 1/25 of a second and adjusted the aperture for a proper exposure. As the train approached, I focused on the cab and moved the camera to follow it. I held down the shutter to take several shots as it passed; this image was the best of a five-shot sequence. I used a DSLR for this, which gives the advantages of faster focus, quicker shutter response, and the ability to take several shots per second. You can do this technique with a point-and-shoot as well, but you'll probably only be able to get off one shot per pass, and the focus won't be as accurate.
If you're hand-holding the camera, rotate your entire upper body (not just your head) as you follow the subject. You'll be more stable, and you'll be able to more accurately track the subject. You can also do this on any tripod that has separate pan and tilt controls. Loosen the pan lock and smoothly turn the camera to follow the subject.
If you're using a DSLR, choose AI Servo (Canon) or Continuous Servo AF (Nikon) focusing whenever you shoot a moving subject. These allow the focus to continually track a moving object up to the point of shutter release as long as the shutter button is depressed halfway. If you use standard autofocus, keying the shutter button halfway locks the focus at that point — the delay between when the focus locks and when the shutter is released will often let the subject move out of focus range.
Also, turn off Image Stabilization (IS, Canon; Nikon calls it VR for Vibration Reduction) whenever you're shooting moving objects. Remember that IS does nothing to help freeze a moving subject: It only helps cancel out movement by the camera.
At least one area of the image should be in sharp focus: the cab on the diesel locomotive above, or the face if you're photographing a person. If everything in the photo is blurred or out of focus, the motion effect is lost — hit the delete button and try again.
It often takes several attempts to get a good image. Don't be discouraged if your initial efforts aren't what you had hoped: Keep shooting, and eventually you'll wind up with some "wow!" shots with this technique.
Tech info: Canon Digital Rebel, Canon 24-85mm lens, 1/25 second. Eastbound Union Pacific freight train, somewhere in Nebraska along U.S. 30.
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