As one can read the normal use of this camera was to film when the trigger on the airplane was pulled to film the effectiveness of the gun fire. This use as seen here i never have seen before nor read anything about it. (i have seen quite a lot ) Taken 1943 Ingolstadt-Manching, I/.NJG 101. Notice the KG16B gun grip an d the REVI 16 C12 D and the power batterie