Sony DSLR-A900 User Guide

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Note on changing the lens
The camera is equipped with an anti-dust function to prevent dust from 
landing on the image sensor. However, quickly change the lens away from 
dusty locations to keep dust or debris from getting inside the camera when 
attaching/removing a lens.
If dust or debris lands on the image sensor
Clean the image sensor using [Cleaning mode] in the 
 Setup menu 
2
Replace the cap on the lens and attach the body cap to the 
camera.
• Before you attach the cap, remove dust from the cap.