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The document follow gives step by step instructions for replacing the focusing screen on the Canon EOS 20D digital SLR camera, with some illustrations. The focusing screen on the Canon EOS 20D digital SLR camera may be readily changed in the field. Often this is desired in order to replace the factory screen with an alternative screen having manual focusing aids, such as a split image prism and/or a microprism field, or merely to replace a damaged screen. I understand that with some aftermarket screens, the shim installed at the factory to properly position the focusing screen must be removed. If you have such a screen, please get the necessary supplemental information from the manufacturer or distributor. The following tools and materials are recommended for the procedure described by this article: Clean washcloth, small cloth towel, etc. Sheet of white bond paper. Scissors. (Optional) One Pec Pad or equivalent (camera lens wipe). Small tweezers with smooth flat tips (be sure they have no sharp edges or “burrs”). Round wood toothpick (must have fairly sharp point). Small block of wood about the size of a small matchbox (or a matchbox). Replacement focusing screen. Preparation: Make sure your work table is clean and well lighted. Place a clean washcloth or equivalent on the table. The camera will be set on this during the procedure. It helps prevent the camera from sliding around when that is not wanted. Place a Pec Pad or a cleanly-cut piece of bond paper about 4”-6” square on the table next to the cloth (not on it). Be sure the paper pad is free of foreign matter. This will be used for the focusing screens and other parts. Replacement procedures: Hold the new focusing screen by the edges and blow off both faces with the blower. Set the new screen flat on the paper pad with the “top surface” up and the “rear edge” away from you. The top surface is the one that has a small “step” around its edges (as if there were a thin slightly smaller plastic rectangle on top of the main body of the screen). The rear edge is the long edge with a single tab at the center. See figure 1, which shows the standard 20D focusing screen. Turn the main switch on the camera OFF.
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