1. An aiming sight for a weapon, comprising: an objective and an image intensifier, these being placed in a mechanical assembly having an interface for fastening on to the weapon, said objective forming the image of the external scenery on the entrance window of the image intensifier, said weapon including a sight camera whose optical axis is parallel to the axis of its barrel, for providing a first collimated image a first optical channel giving, from the intensified image coming from the image intensifier, ; and a second optical channel for providing, from the intensified image coming from the image intensifier, a second image which is also collimated, the optical axis of which is parallel to the optical axis of the first optical channel, these channels being arranged in such a way that, when the sight is mounted on the weapon via its fastening interface, the first image is sent to the objective of the camera and the second image is sent to the eye of the soldier carrying the weapon.