Abstract: An optical test bench for testing the technical characteristics of electromagnetic wave sensors and emitters of an air and ground surveillance electro-optical module mounted on a missile firing vehicle, the module capable of acquiring, ranging and tracking a target and of guiding a missile toward the target. This test device is specifically designed for factory and environmental testing, by opposition to laboratory controlled environment testing. The optical test bench of the invention includes: two parabolic off-axis collimating mirrors, for focusing the fields of view of the module to a common focal point; a computer-controlled focal plane system, including four test assemblies selectively shiftable to register with said focal point, and a laser alignment periscope system to exactly adjust each parabolic mirror relative to the other so that their focal points coincide.