Starting in the 1930s, Germany had begun experimenting with night optics. One of the more well known examples of their work is the “Vampir” night optic for small arms.

The optic consisted of an infrared lamp and a near infrared intensification tube through which the spotlight’s illumination, which is invisible to the naked eye, could be viewed.

The same concept was applied but upscaled to create the FG1250 which was used in conjunection with MG-42 machineguns mounted on vehicles.

With the aid of the massively sized, 200 watt IR lamp it was reported that gunners could see man sized targets at 400 yards at night.

Smallarmsreview article.