The usual goal in photography is to create an exceptionally sharp image. If you're photographing a bird, for example, most photographers want an image that's so sharp you can see every feather on the bird and every barb on the feather.
To capture that, you typically need a sturdy tripod, a cable release, lots of light — and a stationary subject.
But what if the light is dim and your subject is moving? That's when you need to pan — moving the camera with your subject. It involves moving the camera so that your subject is always at the same spot in the image.
