Every time you remove your DSLRs lens to replace it with another, you could be admitting tiny specks of dust that might, if you’re unlucky, find their way past the shutter when it opens for an exposure, and thence onto the sensor. It might take a few weeks or a few months, but eventually, you’ll end up with artifacts on your sensor.

You might not even notice this dust because it’s most apparent when using the small f-stops that produce the largest range of sharp focus. If you take most of your pictures at f/8, f/5.6, or larger, any dust on your sensor might be blurry and almost invisible. In addition, if the dark dust spots happen to fall into dark areas of your image, they’re masked.

So, if you own a digital SLR, you can plan on the need to clean your sensor from time to time. It’s not particularly difficult, and cleaning kits are available at camera stores and online. Some tips to remember include

  • Point your camera downward when changing lenses to reduce the amount of dust that infiltrates.
  • If possible, change lenses only in relatively clean environments.
  • Do not attempt to clean your sensor with canned air, compressed air blowers, lens cleaning liquids, or other methods that seem to make sense but which can damage your sensor. Use only bulb blowers and swabs intended expressly for sensor cleaning.
  • If you have any doubts about your ability to clean your sensor yourself, let your local camera shop or the manufacturer to it.

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