Check the mirror. The image you see in the viewfinder comes through the lens, and is reflected by the mirror. If it's dirty, it will affect the image you see. When you take the picture, the mirror lifts up, the viewfinder image is interrupted, and the light from the lens goes to the image sensor. So...if the mirror is dirty, the picture will be fine but the viewfinder image will be dark or out of focus.
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