I Dare You!

by peter_budo

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I was taking some inside pictures with my Nikon D3100 and 18/55 lens when, all of a sudden, the lens started to work funny -- the more I zoomed in on the subject, the fuzzier the picture looked in the viewfinder. I shut the camera down. The next day I tried it again and saw the same effect. Then I got the idea of seeing how a picture would actually look on the LD screen, and just as suddenly, what I saw through the viewfinder was normal. Things were OK again. What happened?

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fuzzier as in "out of focus"? Was the switch Autofocus / manual focus firmly set on Auto focus? Do you know if your lens has an in-body motor for the autofocus or if the motor is in the camera? Have you took some pics in the "fuzzy" version? and how did those turn out when seen on screen? –  Francesco Sep 22 '12 at 18:43
Sometimes the eyepiece can steam up so be careful ;) –  Dreamager Sep 23 '12 at 11:09
possible duplicate of sharpness lost in viewfinder –  Imre Nov 7 '12 at 18:14
Was the light level very low when the lens was acting funny? If so, the auto focus probably couldn't lock in properly. –  Olin Lathrop Nov 7 '12 at 21:22

1 Answer 1

I bet you accidentally adjusted the viewfinder diopter, which lets you compensate for minor or moderate vision problems without glasses or contacts.

On the D3100, it's a little dial above and to the right of the finder window.

Try this to get it set right: How do I calibrate the diopter correction on my DSLR's viewfinder?

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