The second prototype (Ju 390 V2) was configured for a maritime reconnaissance role, and its fuselage had been extended by 2 meters for a total of length of 33.5 m (110 ft) and it was said to be equipped with FuG 200 Hohentwiel ASV (Air to Surface Vessel) radar and defensive armament consisting of five 20 mm MG 151/20 cannon.