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Two possible situations. It might be that the lens focusing system isn't working. Try focusing by hand (turn the lens manually) If the image moves through a point of sharp focus, then you have a lens or focus motor problem.
More likely, you have improperly adjusted the diopter. There is a small, circular wheel on the right side of the viewfinder, toward the top corner. It is sometimes covered by the rubber viewfinder hood so you might not notice it. This adjusts the diopter correction in the viewfinder and if it's set wrong, nothing will ever look in focus. The pictures would be fine, but since the diopter is a correction for your eyesight, the viewfinder will be out of focus.
Actually what I found to solve the problem was to first set the lens in "MF" and practice taking a picture manually to see if that would work. When I did this, I discovered that the fine tuning portion of the lens was somehow stuck mechanically. I heard a loud click as I turned it. That was all it took to fix the focusing mechanism on the lens. Then I set to "AF" and Voila, the camera worked just fine.
If the AF is set to release then the camera will release the shutter before focus is attained. Set it to focus only and see if it improves. Don't leave it like that, you will miss pictures. Shoot some pictures with the center AF point only in single release and see if the focus is consistently landing in front of or behind what you wanted in focus. A penny on the sidewalk shot at a 45 degree angle in aperture priority with the lowest A number possible is a good quick one. For super fine tuning with a f2.8 or faster use a fuzzy plant branch like a tomato plant. If whats in focus is always in front of or behind what you focused on then you need too adjust the focus(back focus) in AF fine tune until it lands where it should. It's an annoying process that involves shooting, adjusting, shoot again, see if its better or worse, adjust, shoot and repeat. On zoom lenses use the middle on the zoom range because it will usually go from back to front focusing on the long and short end. The camera remembers each lens and the process must be repeated for each lens. Last thing I can think of is the one that no one wants to hear and is most likely the problem, Camera Handling. People have a tendency to get sloppy after getting use to a camera. I have noticed that the VR lenses don't like people that stab the shutter button. It wants to remove fine vibration and a harsh stab makes it jump back to center and if the shutter opens at the same time it will put fine motion blur in the picture and looks out of focus.
That is the focusing ring. I'm guessing your camera is set to focus automatically (Little switch on the side of the lens should have settings for either AF or MF, or something similar.)
If its on AF, you don't need to adjust the focus ring. However, if you have problems with the AF (sometimes it has trouble, especially in low light) you can switch it to MF, and focus manually by changing the ring.
As a general guideline, the more you twist to towards macro, it focuses closer and closer, and infinity futher away (if you're taking a shot of the moon, you want it on infinity)
it´s pretty normal on that camera model, there was a problem on the focus system and they are fixing it when u send to a repair centre, they just don´t say it, but once u send it they will repair it, and will be fine.