An anti-aliasing filter sits behind the lens of the 5D.
Filters are great for adding effects to photographs while you're shooting. Programs like Photoshop can add these effects digitally later, but it's not quite the same. While most filters are a screw-on type that attaches to the end of any lens depending on the diameter, anti-aliasing (AA) filters typically sit inside the 5D between the lens and the mirror. Removal is a simple process.
Instructions
1. Work on the camera in a clean, relatively dust-free area. You will be removing the lens of the camera and exposing the 5D's sensor to the elements.
2. Make sure that the camera is off.
3. Depress the lens catch button. The 5D will be to the left of the lens.
4. Turn the lens to remove it from the camera. Looking at the 5D, you will be turning the lens counter-clockwise. Put the lens caps on each end of the lens before setting it down anywhere.
5. Using the small Phillips screwdriver, remove the two small, silver screws holding the square filter in place.
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