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<blockquote data-quote="J-see" data-source="post: 428943" data-attributes="member: 31330">You can only tune focus at a certain distance if you dot-tune and that's it. Too close to the minimal focal distance won't work and too close to infinity won't work either. I pick a distance that is practical and doesn't require me to call a taxi to set up my focus target. Like I said, advised is 50*focal length but it's up to you if you prefer shorter or not or a bit further. At a too long distance you simply won't know if you set the lens at its sharpest since there is too much elbow room. Your DoF is gigantic at 2 miles. At a close distance when you see every detail of your focus target, it is much easier since your DOF is also much smaller and even the tiniest bit focus is off, shows at max magnification on the live-view.If you focus on some distant object, how can you know if it is at a 90° angle to your camera and if the surface you set focus on is perfectly flat?</blockquote>

[QUOTE="J-see, post: 428943, member: 31330"] You can only tune focus at a certain distance if you dot-tune and that's it. Too close to the minimal focal distance won't work and too close to infinity won't work either. I pick a distance that is practical and doesn't require me to call a taxi to set up my focus target. Like I said, advised is 50*focal length but it's up to you if you prefer shorter or not or a bit further. At a too long distance you simply won't know if you set the lens at its sharpest since there is too much elbow room. Your DoF is gigantic at 2 miles. At a close distance when you see every detail of your focus target, it is much easier since your DOF is also much smaller and even the tiniest bit focus is off, shows at max magnification on the live-view. If you focus on some distant object, how can you know if it is at a 90° angle to your camera and if the surface you set focus on is perfectly flat? [/QUOTE]

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