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The thing is - the (manual) focus confirmation dot has a very wide "in focus" range. I wouldn't call it exactly accurate near the "edges" of that range. This may be Okay for slow speed, wide angle lenses but that's about it - in my opinion.
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Not sure, if faster lenses could get better focus accuracy because of shallower DoF. I think it depends on the lens' overall performance. The more CA wide open, the worse the accuracy?