Jamie Pillers
Skeptic
There's no setting I know of to preset focus to a certain distance. However, you could easily set it via autofocus and then flip the switch to MF to hold it there. The switch for AFS/AFC/MF is on the front of the camera. With older manual focus lenses, you could also use the distance scale.
Yes, there IS an easy way to do this. Set the camera to manual focus mode first. Then simply point the camera at some object that's located at the distance you'd like to use for zone focus (for street photography, I point my XPro1 at a spot about 3 paces in front of me on the ground and then press the AE-L/AF-L button. It instantly locks the lens at that distance. Presto... zone focused! 🙂