While collecting biometric data from parallel versions of Peter Venkman and Winston Zeddemore on the second floor of the Firehouse, Egon Spengler set up the camcorder on its stand and recorded the session.
Unlike today's Camcorders, older camcorders had a second device for recording the actual footage called a Recording Module. It appears under the right arm of both Ray and Peter in the scenes with the Camcorder.
External Camera LightEdit
The External Camera Light can be seen in Rays left pocket in the Library scenes. It was not shown in use.