John Navitsky
Well-known member
May i ask Why ?
because for mirrorless the sensors used for af and for the actual image are on the same focal plane, so when the lens achieves focus for the af sensor, it will be in focus for the image sensor as well. you should be able to take a lens that is otherwise optically good, but has severe front or back focus, put it on a mirrorless and it should focus correctly. it’s kind of a closed loop: when it’s in focus; it’s in focus. my understanding is it’s a little bit more complicated than that, but that’s more or less the idea. my understanding is that the fine tune adjustment exists on mirrorless is largely to allow you to shift the focus point for other reasons, like dealing with tricky focus traps
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