Another trick, if you want to hang something centrally and there's no central stud, is to locate the two studs closest to the center point. Screw a piece of 2"x1" planking into the two studs, to take the weight, then place a screw or other hanging point in the center point of the wall, along that plank. That way, the studs take the weight. It doesn't matter if the hanging point is at the center of the plank, or offset to one side or the other - the studs will still support it. If the frame needs to be more level in the vertical plane, get a doorstop or something similar and glue it to the bottom of the frame, so that it stands out from the wall approximately the same distance as the hanging point.
I considered trying to convey this idea, but gave up after realizing my grasp of english language and vocabularly wasn't sufficient - so - what Preacherman said. He has it right on there.
Another trick, if you want to hang something centrally and there's no central stud, is to locate the two studs closest to the center point. Screw a piece of 2"x1" planking into the two studs, to take the weight, then place a screw or other hanging point in the center point of the wall, along that plank. That way, the studs take the weight. It doesn't matter if the hanging point is at the center of the plank, or offset to one side or the other - the studs will still support it. If the frame needs to be more level in the vertical plane, get a doorstop or something similar and glue it to the bottom of the frame, so that it stands out from the wall approximately the same distance as the hanging point.
Bingo!