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What I usually recommend when this happens is to DotTune 2-3 times using the same locked focus. This helps troubleshoot technique. If that produces the same midpoint each time (as it should), then try it again but refocused in LiveView and see if you still get the same midpoint. If you don't then the variation is due to variation in LV focus. If the midpoint variation is more than a few points I would then recommend using a 3D target like a lensalign, that way you'll be able to verify focus to an exact point and DOF, at which point...Show more →
ok, just want to do a run through what I am doing in case there is something I am doing wrong too: so I set up the target (I have the new one you posted with the lines), set tripod 50x focal legth, select live view, 10x zoom, focus, switch to MF, and start testing. I do my testing looking through the view finder.
So once I do one set of ranges, repeat 2 more times, correct?