for cleaning lenses and in particular the sensors of digital cameras with interchangeable lenses. Since the surface of the sensor must be touched under any circumstances, I use the balloon to carefully aspirating possibly particles out (usually some dust). A blowing dust into the camera body, I do not think it helpful, because the particles settle somewhere inside there and can cause interference. Depending on the indentation of the balloon can also pull the control in its strength. In any case, a low-cost part, compared to the regular camera accessories. See Department.
