With all PC(-E) lenses I used (24, 28, 35, 45), metering after shifting will cause moderate to massive overexposure. Tilt alone is not a problem.
Consequence is, one has to switch off auto ISO and revert to manual mode.
With the Df and using the non-E lenses, using the non-AI mode is convenient provided one does not forget to set the aperture on the camera's dial, corresponding to the preset on the lens. Takes some time before it becomes rountine.
When not shifted, I prefer to set the lens in AI mode + aperture priority mode + stopped-down metering + auto ISO. Sole downside is, the f stop is not recorded (so what...). With such settings, using the old PC lenses is pretty easy. The left hand has to focus as usual + close the diaphragm after focus + re-open it after the shot.
When using shift, the routine is : 0) pre-set diaph on lens and camera 1) frame (typically aiming at a distant point deemed to be at the same altitude as yourself) 2) focus 3) set exposure using the speed dial + fine-tuning with the thumb wheel 4) if that is not enough, change the manual ISO setting on the dial and frame again 5) close diaph 6) apply shift trying not to move the camera up or down, still looking through the viewfinder, and checking parallelism of vertical lines (for instance) 7) pull the trigger
![Cool 8)](https://nikongear.net/revival/Smileys/default/cool.gif)
re-open diaph 9) remove shift 10) back to 0 or 1.
Now that makes photography enjoyable and will drive away any superfluous bad thoughts.