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Message: <blockquote data-quote="henry link" data-source="post: 3687584" data-attributes="member: 6806">Hi Jerry,Kamakurs's variable speed focuser isn't complex at all. It might seem so if you try to follow the patent text, but the figures reveal that the only difference between fixed speed and variable is the shape of the cam groove; straight for fixed and curved for variable. I think the only reason there is so little demand for focusers of this type is ignorance of the advantages, especially for binoculars with very close focus.Henry</blockquote>