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Message: <blockquote data-quote="Marcel" data-source="post: 431508" data-attributes="member: 3903">Oh, this is the focusing screen spacer. Now, depending on the thickness difference between the original focusing screen and the one you did use to replace the original, this spacer could very well change the focusing distance between the lens focal plane, making the use of manual focus to mis-focus.This distance must be exactly the same between the lens focal center and the sensor and the focusing screen. The way to test it is to compare manual focusing to LiveView focusing and adjusting accordingly. The focusing screen replacement usually comes with instructions about using these different focusing screen spacers.</blockquote>