The reason for the blur thru the viewfinder may be one of several things.
1) Check to make sure your lens is set to autofocus, sometimes the button is cut off in error. If the AF button is cut off in error, looking thru the viewfinder will be blurry, until you manually focus the lens.
2) Check your diopter, it’s the small button next to the viewfinder, turn it while you are looking thru the viewfinder until it you see sharp or clear. On some cameras this button can also accidentally be moved.
Note: Also make sure your lens is attached to the camera correctly, line up the dot on the lens, to the dot on the camera turn until you hear click, at this time you know the lens is attached correctly.
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