46. YOUR SENSOR’S DIRTY SECRET

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EVEN IF YOU never remove the kit lens from your camera, a small amount of dust is going to find a way past the lens mount and, eventually, onto your camera’s sensor. That flapping mirror causes the tiniest dust particles to become airborne and, sooner or later, come to rest on the protective filter atop your sensor. Most of the time you’ll never notice the presence of dust on your sensor because the tiny particles are out of focus at most aperture settings. But if you happen to take a few shots using a smaller f/stop, such as f/16 or f/22, these artifacts may become visible, especially against a relatively plain ...

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