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Message: <blockquote data-quote="Marcel" data-source="post: 218055" data-attributes="member: 3903"><p>Yes, I have. I have used the retractable lens brush to remove dust from under the focusing screen and it did not hurt it at all. I've also replaced my focusing screens in my D7000 and D700 so I could manually focus my old faithful Ai and Ais lenses. A brush is not as abrasive as a Q-tip. And some people might put to much pressure on a Q-tip where with the brush you can't until the metal part comes into contact with the glass. If you'd push that hard on a brush, then yes, you could scratch the glass.</p></blockquote><p></p>