The light and camera it takes to freeze the action
Last time, we looked at how to snap a picture with the ball over home plate, which turned out to be much easier than the numbers would suggest. Now though, we have a tougher challenge: making that ball stop moving. Let’s take a look at the picture we started with at original size.
The ball is in the right place, but it’s in a bit more of the right place than it should be. What went wrong? Well, from our calculations last time, we know that the ball is moving at around 1400 inches per second. The shutter speed in this photo was 1/1600s, so that tells us that the ball moved approximately .88 inches in the time that the shutter was open. A baseball is about 3 inches in diameter, so it had enough time to move almost one-third of that distance. That just won’t do. What would we get for different shutter speeds?
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