How To Help Keep Your DSLR's Sensor Free From Dust

1. When changing your lens try to do so with the camera pointed down or away from the wind.
2. When using a zoom lens try to zoom in and out slowly to help reduce the risk of the lens causing suction and pulling dust into the camera body through the lens.
3. When shooting in dusty or windy conditions, such as the beach, try wrapping the camera body in a plastic bag to help keep out dust and sand.
4. If you must change a lens out in the field, while shooting outdoor photography, try to do so in a somewhat sheltered place such as a bus stop, a building, or in your car.
5. Be sure to turn your camera off before changing lenses, this helps reduce the risk of dust particles being electrically attracted and sticking to the sensor.
6. Try to be prepared, when changing your lens try to have your lens "ready to go" to avoid extended periods of time with nothing protecting the camera body.
7. The best way to keep your sensor clean is to just pick a lens and stick with it but if you can't these tips will help you keep your sensor clean.