What's wrong with the right half of the photo taken by Nikon 18- 140 lens?

Is it just half empty or empty? If it is the former, the optical axis of the lens deviates, the lens may tip over or the internal focusing gear/rack is excessively worn, and this lens needs to be repaired; If it is the latter, it is basically out of focus. I don't know if you have tried it with other lenses. If it is the same, it may be that the camera CMOS is not installed in place, so just send it to the maintenance center to adjust the fuselage. You can also take a newspaper at home after fixing the camera with a tripod to see how the depth of field is before and after focusing. Normally, the foreground depth is slightly smaller than the back depth of field (I found that the foreground depth is very large and the back depth of field is very small when I tested the newly changed D6 10 last year).