-Find zombie's at medium to long range
(hard to make it work on very long range zombie, only worked once for me.)
-Preferably facing in your direction
(i have not noticed it on zombie with their back turned)
- press right click mouse to zoom in
- zoom in fully OR Half Zoom to near full and let go.
- (Optional) Move/strafe left and right while holding / pressing zoom button.
- Zombie will look at you and search for you.
- some Zombies run to you straight away others look around left and right then run to you shortly.