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I was playing a bit with my dioptric adjustment and found out that I see best with that being set to the lowest value. How is this possible? My eyesight is probably nearly perfect and I would definitely know if it was -3.

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I'm guessing you actually are seeing best when it is set to the other end of the adjustment range: +1 diopter. Just as someone can have 20/20 distance vision and need reading glasses with a positive diopter to see things that are close, even if you have 20/20 or better distance vision your eyes may no longer be able to relax enough to focus on very near objects.

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Don't know what you mean by your eyesight being "probably nearly perfect." Do you have the results of an actual eyetest? It's quite possible you've got a little myopia (near-sightedness).

Next, the diopter adjustment may well be a bit off, especially if you're holding the camera even a bit closer or farther from your eye than the baseline calibration is set for.

BTW, for those who care :-), "diopter" is the inverse of the focal length of a lens. A lens of -3 diopters has a focal length of -3.33 meters.

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  • \$\begingroup\$ Probably nearly perfect = don't wear glasses, see quite well \$\endgroup\$
    – user49129
    Commented Jun 20, 2016 at 19:17

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