Later variants, in the Do 17 Z-3, Z-4 and Z-5, which were fitted with cameras, dual trainer controls and flotation aids (for maritime operations) respectively, still could not solve the problems with range and bomb load.
Kasnije inačice, Do 17 Z-3 Z-4 i Z-5, koje su bile opremljene s kamerama, dvostrukim kontrolama i plovcima (za pomorske operacije) i dalje nisu mogle potpuno savladati probleme s doletom i punim opterećenjem naoružanja.