The Northrop "Target Identification System Electro-Optical (TISEO)" camera system was also introduced in late F-4E production and retrofitted to older aircraft. TISEO involved a steerable, stabilized telescopic camera mounted on the left wing, and was used primarily to inspect targets before engaging them.
TISEO imagery was displayed on the WSO's radarscope. The camera could be slaved to the APQ-120 radar, and apparently there was an upgrade that allowed it to be linked to the navigation system to target flight checkpoints as well. Of course, it was a daylight / clear-weather only system. Most export F-4Es were not fitted with TISEO.