What does the diopter control do on my D3200, and how do I reset it? Christos Panayides, Cyprus
Chris says… This tiny dial simply controls the focus for the viewfinder eyepiece and has no effect on the image you capture with the camera – it’s there to allow for variations in individuals’ eyesight.
Some people are long-sighted, some are short-sighted, and diopter adjustment enables them to bring the viewfinder image into sharp focus even if they’re not wearing their glasses. There is no correct, or default, setting – you simply turn the adjuster until the focus points and the information display underneath the screen are sharpest.
Don’t look at the subject you’re photographing, however, because this will go in and out of focus as the lens focuses, and could be misleading.