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Message: <blockquote data-quote="WayneF" data-source="post: 224218" data-attributes="member: 12496">Technically, when the focus is moved way out, the lens no longer can focus - at least the focus ring is not designed for this new extreme range.  Which is true of all lenses, and the way we have to focus with extension tubes is by moving the camera back and forth, to find the one place where it actually achieves focus.   Just saying, first appearance is that it cannot focus, but the workaround is to do it by moving the camera back and forth.  This is difficult on a tripod. You can buy focusing rails to help do this, but the cheap and easy way is to place the macro subject on a small board, and slide the board back and forth in front of camera.</blockquote>