Abstract: Device intended to determine the portion of a field seen by the eye (5) of an observer.According to the invention, this device includes:an optical sighting system (2, 3) through which said eye (5) looks at said field, said optical system comprising an exit eyepiece (15) behind which said eye (5) is placed; anda first optical component (22) placed on the side of the object focal plane of said exit eyepiece (15), said first optical component letting through the light rays (16) which come from said field and which pass through said optical sighting system and sending to said eye (5) a light beam (24) emitted by a light source (23) in order to form at least one reflection.

Abstract: This invention relates to a system for locating a body in motion with respect to an axis, comprising an optical detector disposed in fixed manner and cooperating with an optical emitter connected to said body in motion, system wherein said optical detector comprises a fixed matrix of controllable photosensitive elements; said optical emitter produces flash signals; and synchronization means are provided for said electronic control means to deliver control pulses synchronized with said flash signals and triggering off the taking of an image. The invention is more particularly applicable to the location and guiding of missiles.