What's going on with the zoom?

What’s going on with the zoom I’m on top of my tank or on top right on top of my helicopter or plane when I’m in third person view

The zoom in 3rd person goes to the commander’s position until you scroll past it with mouse wheel zoom. If you have sniper mode toggleable, and use a keybind for zoom if you are in 3rd person it will take you to the commanders position, but in sniper mode (gunsights) it will zoom the gunsights in vehicles that had variable power gunsights.

For the aircraft, zooming in just moves the camera closer to the plane to achieve the zoom in 3rd person. If the vehicle is equipped, you can change to laser/tv guidanceby using change view keybind to see the laser/tv weapon sights.