Rank: Wiz
Rating: 82%, 35 votes
If there is a diopter adjustment, for the viewfinder (to take into account a person wearing glasses) then that may have been changed and images just appear out of focus(in the viewfinder) when in reality, they may not be, if the camera is in autofocus mode.
Check these settings. Since I do not know what kind of camera this is I cannot be sure whether this diagnosis is valid.
What do the images look like when you download them?