A professional camera repair center should check image sensor problems.
A camera's image sensor converts the light of an optical image to an electrical signal. In SLR cameras, this sensitive device lies hidden by the mirror until the shutter opens. Sensor dust that appears on images causes one of the most common sensor problems.
CCD Image Sensors from 2002-2004
A wide range of digital cameras produced between 2002 and 2004 developed image sensor problems in 2005. The charge-coupled device (CCD) image sensor could fail, especially in high humidity and heat. Problems included distorted images or purple or green color casts. Sometimes no picture resulted.
Sensor Dust
Digital cameras with interchangeable lenses can collect sensor dust. These particles look like small gray smudges on images shot with a small aperture to produce a large depth of field. Dust can accumulate and the problem worsens.
Although this problem is known as sensor dust or dust bunnies, the image sensor does not actually touch the dust. An element such as the low-pass filter or the dichroic mirror in front of the image sensor attracts dust particles. When the power turns on, the charged surface attracts the particles.
Prevention
Quickly changing lenses with the camera mount facing down can avoid dust from entering the camera body. When not in use, lens caps should cover and protect both the front and back of the detached lens.
Most current digital SLR cameras feature a dust control system that uses vibration to shake or repel dust from the sensor area when powered on. For example, certain Canon cameras feature anti-static coatings and a self-cleaning sensor unit that vibrates to clean the low-pass filter.
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