Further to Bills comment. There were two versions of the Cadillac De Ville camera that are easily differentiated. The Mk1 was a bit of a disaster. It had an oval lens barrel with a Germanium window sealing it. When the window got broken by a flying stone water ingress followed. The unsealed lens barrel then allowed water onto the electronics package. The Window was not user replaceable. The Mk2 camera was a superior design that incorporated lessons learnt from the Mk1 issues. It has a sealed lens assembly so if the window fails, only the objective lens behind it gets wet/dirty. The window is also user replaceable by easy removal of the front window retaining ring. Both my cameras are Mk2 units. Working Mk1 units are quite rare and, in my opinion, best avoided.
I note from the documentation that I can find on the Cadillac De Ville night vision system that no true resolution is stated. The cameras operating thermal resolution seems to be deliberately omitted. Even Raytheon/L3 appear to omit the resolution for that particular camera. We know that it uses their 320 x 240 sensor, but that means little without knowing how the sensor is operated, full resolution, or windowed.
I also note that Bill has advised that the Zoom setting was a ‘return to factory’ setting. This makes me think that Windowing (electronic zoom) was a method of deliberately crippling the cameras resolution to meet either Authorities or OEM requirements. Most modern cameras provide electronic zoom on a simple command or I/O pin. No return to factory required. Some BST cameras that used the same core offered X2 zoom to the user via a button operation. Those cameras were already operating at 320 x 240 pixels so no OEM or authorities were involved in crippling the resolution in that particular deployment.
Fraser