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When it comes to seeing through a viewfinder, many folks don’t ever bother to adjust the diopter of their camera. But the truth is that you really should adjust it lest your eyes strain when looking through this very small hole. The problem though is with people not knowing how to properly adjust it for themselves.
For starters, consider your eyesight. If you wear glasses you’ll know whether you’re near sighted or far sighted. Depending on your prescription, you’ll want to adjust the diopter accordingly. Diopters often have a +2 or =3 setting to enable photographers to adjust what they see through the viewfinder for their vision.
Both EVF and OVF work differently though. With an EVF, it’s mostly a matter of looking through the viewfinder, turning on text displays and adjusting the diopter until you can see the text correctly. But when working with an OVF, it can become much trickier as what you’re seeing is optical and not electronic. For optical viewfinders, we recommend taking the lens off, pointing the camera at a light source and looking at the focusing points through the viewfinder. Then adjust the setting accordingly until you see them the clearest. When this is done, you’ll have set the diopter for your eye.