![]() ![]() Lenses and cameras are made to certain specifications, and those specs fall within a narrow range of tolerances. You can read that if you like technical stuff, but I’m about to summarize it in the next paragraph. That last link is the first in a 4 part series, but right there in that first part is a really good example of what AF microadjustment can do. Why You Can’t Optically Test Your Lens with AutofocusĪutofocus Reality, part 1: Center Point Single Shot Accuracy ![]() ![]() Here’s some light reading, if you feel so inclined: But the gist of his articles is basically this: phase-detection AF isn’t always that accurate. “I’m trying to focus on this person’s eyes, but the ears are in focus instead,” or, “This lens is front focusing like crazy,” or, “This fast aperture prime was soft the whole time I used it.” Roger has written some rather lengthy, detailed posts about how phase-detection AF works (phase detection being the kind you use on a dSLR in normal, everyday shooting) so I won’t go into a full explanation here. The most common questions and complaints I hear almost always have to do with AF accuracy, in one way or another, even if they don’t seem like it at first. ![]()
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