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Message: <blockquote data-quote="Patudo" data-source="post: 3616454" data-attributes="member: 139299">At the risk of swerving wildly off what was clearly intended to be a light-hearted thread, I have to admit to being surprised that even top manufacturers seem to have had difficulties in this department, given that internal focusers have been incorporated into binoculars for decades.  Can someone knowledgeable on this thread provide some insight as to the challenges in designing and manufacturing a trouble-free focus mechanism (leaving aside issues of "feel")?  I personally have not (yet) had real issues in this department, but it seems clear that others have - and I mean genuine issues like the Noctivid being discussed in the Leica thread rather than whether a focuser feels rough or has more resistance in one direction than another.NB. I've hunted around here and Cloudynights for "super light grasp" but can't seem to find the post WJC mentions... a shame as I'd have enjoyed reading it in full.</blockquote>