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Message: <blockquote data-quote="crycocyon" data-source="post: 131749" data-attributes="member: 13076"><p>It should be at infinity? What exposure times are you using and are you shooting wide open? Depending on how much of the moon is occupying the field of view, your camera might be overexposing, hence the camera-shake induced blur. Mirror up means you lock up the mirror that normally flips up during an exposure but if you lock it up ahead of time, then that eliminates any vibration caused by the mirror alone. That lens isn't very big and heavy so that wouldn't be the issue. It could be that your tripod is simply not stable enough. What kind are you using?</p></blockquote><p></p>