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Message: <blockquote data-quote="J-see" data-source="post: 455940" data-attributes="member: 31330">You don't need a chart to use Dot-tuning. You just need something with enough contrast to focus upon. I never use a chart. I tune a lens within some minutes. Get focus, go through the range, set middle: done. I don't need to take one shot.The shortcut here is that the focus confirmation is used while going through AF-tuning. You detect the range it gives focus, set the middle of that range and the lens is perfectly tuned. It's not needed to take shots, just pressing the shutter to see if or if not the cam considers it in focus.If my cam/lens gives a full dot from -4 to +6 I only have to set it to +2 and I'm done.</blockquote>