My Nikon won't focus through viewfinder but the photos come out fine?

So all of the sudden my Nikon d7000 won't focus well through my viewfinder, but the photos come out in focus when I use auto focus. I can't use manual focus because my camera shows me that the photo isn't in focus no matter how much I focus it manually. Maybe I just need to clean my contacts? I used another Lens and the same problem happened. It was fine the day before

So all of the sudden my Nikon d7000 won't focus well through my viewfinder, but the photos come out in focus when I use auto focus. I can't use manual focus because my camera shows me that the photo isn't in focus no matter how much I focus it manually. Maybe I just need to clean my contacts? I used another Lens and the same problem happened. It was fine the day before 1) make sure that the diopter on your viewfinder is set correctly
2) use the electronic rangefinder in the viewfinder to accurately focus your shots manually

Look on page 100 to see how to use the electronic rangefinder

And page 34 to see how to use the diopter If the dioptre adjustment in the viewfinder is correct then the only other cause is that the focussing screen has been disturbed, either by dropping the camera or by a ham-fisted attempt to remove or replace it. That would cause the plane of the screen to be misaligned so that the plane in which a focussed image would appear is above or below the screen. Usually a poorly-seated screen sits in front of the image focal plane. There's a dioptre adjustment by the viewfinder, which you can adjust to suit your particular eyes. It's a tiny wheel right next to the viewfinder. It's likely that you've inadvertently adjusted that. Look at any image and get the camera to focus itself, and then adjust that wheel until the image looks focused to your eye. Problem solved, I hope. Adjust the diopter. See the manual.

If the dioptre adjustment in the viewfinder is correct then the only other cause is that the focussing screen has been disturbed, either by dropping the camera or by a ham-fisted attempt to remove or replace it. That would cause the plane of the screen to be misaligned so that the plane in which a focussed image would appear is above or below the screen. Usually a poorly-seated screen sits in front of the image focal plane.

There's a dioptre adjustment by the viewfinder, which you can adjust to suit your particular eyes. It's a tiny wheel right next to the viewfinder. It's likely that you've inadvertently adjusted that. Look at any image and get the camera to focus itself, and then adjust that wheel until the image looks focused to your eye. Problem solved, I hope.

Adjust the diopter. See the manual.