A thermal imaging system (100) for a vehicle includes an objective lens (104) for receiving an image of the object, an eyepiece lens (102) for viewing the image of the object, and a compensator lens (106) movably located between the objective and eyepiece lenses (104, 102) for providing a thermal image...http://www.google.com/patents/US5600491?utm_source=gb-gplus-sharePatent US5600491 - Thermal imaging system for a military vehicle
