08/11/2016
"Automatic Sensor Cleaning" - what is it, and how does it work?
Many Nikon & Canon cameras now come equipped with an automatic sensor cleaning mode. Most systems work by using piezo-crystal induced ultrasonic vibration of the IR filter on the sensor at 35-50kHz. Other systems vibrate at a much slower frequency of around 100Hz, but with much further travel.
What happens to the dust? When vibrated off the IR filter, it should fall to the bottom of the sensor where a dust trap collects it. The dust will fall unless the air currents around it, or electrical charges acting on it, are stronger than gravity.
How does it work compared to a blower? It depends on the type of dust or other substance. Normal dust is fairly easy to remove. Dust that has been damp is more difficult because it causes the dust to be more strongly attached to the surface it lands on. Other substances, such as the lubricants used inside the camera body, can become a gooey mess that neither an automatic cleaning system nor a blower can remove. Another problem with using blowers is that they often introduce more dust into the system than they remove, especially if you are using one without a filtered intake on one side and the outlet on the other.
So, in summary, the automated sensor cleaning mode is a useful feature, and definitely better than not having it. It can be about as effective as a blower in most scenarios. BUT, it can’t deal with residues, lubricants and other stubborn dirt that may find its way onto the sensor.
What's the most effective and safe way to clean a sensor? There isn't just one method. There are more effective methods, and there are safer methods, and these are generally inversely proportional to each other. In order of risk, the methods are: Automatic dust removal system, air blower, electrically charged brush, and wet cleaning systems that use swabs and cleaning fluid.
At Sensor Cleaning Ireland we use a combination of methods to ensure the safest and most effective clean. If you have stubborn dust, residue or marks on your sensor that the automatic cleaning mode isn’t removing, contact us and we’ll be able to help you out.