I was under the assumption it is exactly infinity focus after a certain distance. In this case 7.5m. The distance of the the view from the lens to the street lamp is 18.9m and should be in focus. From the Hikvision Data Sheet:
Depth Of Focus
2.8 mm, 2.5 m to ∞
4 mm, 3.5 m to ∞
6 mm, 7.5 m to ∞...