A soft, lint-free cloth can remove dust from the focus screen.
The Canon EOS Rebel XTI digital camera has a focus screen that can be used to frame shots when the LCD monitor screen is not being used. The focus screen is the part of the viewfinder that helps the user focus on the image being photographed. The focus screen can accumulate dust over time. Canon recommends using a blower or compressed air to clean the focus screen when possible. Additional steps can be taken to clean the focus screen if needed.
Instructions
1. Hold the compressed air about 6 inches away from the camera. Spray the compressed air on the focus screen, moving the can back and forth constantly.
2. Wipe any remaining dust off the focus screen with a soft, lint-free cloth. Use gentle horizontal strokes.
3. Apply one or two drops of clean water to the lint-free cloth. Wipe the focus screen with horizontal strokes to remove the last of the dust particles and any fingerprints or smudges.
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