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Message: <blockquote data-quote="FernandoBatista" data-source="post: 1804408" data-attributes="member: 10035">You know it by eye <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /> Take off the lens, point the camera at the sky or something else that’s bright and even, and look at the focus points or something else in the viewfinder, then adjust the diopter to make them look as sharp as possible. Take off the lens so you don’t get distracted to what is being seen at the moment.In my D90 I have the dioptre set in the middle more or less.Also, eye position is important, there is a difference if you move your eye 1mm or so to the sides, I only noticed this recently but it’s very noticeable. For example, if I’m focusing on something on a corner, I will move my eye slightly closer to that corner so I have the sharpest possible image in the viewfinder. I can still focus well enough if I keep the eye in the middle of the viewfinder, but the difference is clear when I move closer. This is on Nikon vienfinders, I’m not sure how other brands will work, I think this is due to the fresnell lens used as the focusing screen, I’m not sure but I don’t think every brand use this type of focussing screen.I also use this:<a href="http://www.amazon.com/KPS-Viewfinder-Magnifier-Eyepiece-Olympus/dp/B001NXPHT2" target="_blank">http://www.amazon.com/KPS-Viewfinder-Magnifier-Eyepiece-Olympus/dp/B001NXPHT2</a>It helps a bit, and is very worth the money. But it's just a slight improvement, you should be able to focus consistently with a standard camera.Apart from that I don’t know what else to say. But in my setup is so clear what is focused from what is not that it’s hard to miss focus, even in very dim light.</blockquote>

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