Abstract: An optronic observation device including a detector having a photocathode and a sensor arranged to receive an incident light beam. The device also including a switch to position an optical element opposite the detector in the pathway of the incident beam or to retract the optical element and a focusing element to focus an incident ray on the photocathode when the optical element is in a retracted position. When the optical element is positioned opposite the detector, it is able to focus the beam on the sensor and to filter the beam spectrally to block all or part of the wavelengths for which the responsiveness of the photocathode is greater than a given threshold.

Abstract: The invention concerns an optronic observation device comprising a detector, the detector comprising a photocathode and a sensor arranged to receive an incident light beam, the device also comprising switching means able to position an optical element opposite said detector on the pathway of the incident beam or to retract said element, the device comprising means able to focus an incident ray on the photocathode when the element is in retracted position, characterized in that the element, when positioned opposite the detector, is able to focus the beam on the sensor and to filter the beam spectrally to block all or part of the wavelengths for which the responsiveness of the photocathode is greater than a given threshold.

Abstract: An asymmetric binocular viewing device having a first and a second optical axis forming a horizontal plane. A single objective, a related luminance intensifier tube, a semi-reflecting optical image splitter and a first ocular are aligned in succession the first optical axis. A second ocular related to the optical image splitter by an optical image transmitting system is aligned on the second optical axis. The optical image transmitting system includes in succession a first mirror, an lens system, a second mirror, and a third mirror. The elements are arranged so that an optical path is defined starting from the optical splitter and including a first vertical axis section, a horizontal axis section, and a second vertical axis section describing a U turned upside down in the shape of a bridge located on a vertical plane and perpendicular to both parallel first and second optical axes. This defines a free space between both the first and second oculars freeing up the space for the user.