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It does beg the question that has not been asked. How many turns of the focus knob are you getting between the stops? It might be in the videos but I can not open dropbox files at work and we are currently "Enjoying" an NBN connection with a download rate anywhere down to 1mbps, which apparently has nothing wrong with it, so opening the videos at home is not workable either.
You should see something in the order of 30 turns of the focus knob from end to end.
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