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Message: <blockquote data-quote="Fortkentdad" data-source="post: 642591" data-attributes="member: 24285">I also have one of these. If you press down on the button with the white dot and rotate it clockwise so the white dot is opposite the orange mark, the F-stop ring will lock into the orange F22 position. Push down on the white dot button and rotate the F-stop ring to unlock it. If you press down and rotate the white dot button counterclockwise (so the white dot is towards the lens mount), then the F-stop ring will not lock.Hope this helps.</blockquote>Got it to work, thanks.  Liking this 'vintage' lens - very light, focuses seems fast enough.  Going to be giving it a go tomorrow shooting the grandkids at play.[/QUOTE]