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Message: <blockquote data-quote="Troubador" data-source="post: 3686763" data-attributes="member: 109211">It sounds a great idea but look at the problems regularly encountered with today's much simpler systems: free play (movement of the focus wheel with no corresponding shift in the point of focus), rough-feeling focus, focus too tight, focus too loose. focus has a different torque in one direction compared with the other, and don't lets get into dioptre adjustment problems which are part of the same system.The complexity of switching from one gear ratio to another to move between fast and slow focusing would bring weight, free play and focus 'feel' issues with it.Put it this way, how useful would it be to switch between magnifications on your binos? Would this be more obviously attractive to more people that switcheable focus speeds? I would think so, but how many brands apart from Leica offer binos with this facility?On the other hand maybe a mechanical genius could come up with a lightweight compact and reliable system and prove me wrong.Lee</blockquote>