Optical device, comprising: - a plurality of image (120, 130) sensors (2, 3, 4) observing the same scene having a common sighting direction, and different angular fields and resolutions: - an output medium for processing a final image consisting: ∘ in a central area of said final image, of an image obtained from the sensor having the highest angular resolution of the sensors; ∘ in a peripheral area, of a peripheral part of an image obtained from a sensor having the lowest angular resolution; characterised in that it comprises - an angular field selector suitable for enabling a user to select an angular field value for the final image, - a controller suitable for forming the final image corresponding to this angular field value based on the images obtained from the various sensors ∘ parts of images obtained from the various sensors and used for forming the various areas of the final image corresponding to sensors having a decreasing angular resolution from the central area to the periphery of the final image, ∘ said controller using, for each area of the final image, a part of an image obtained from the sensor having the highest angular resolution of the sensors observing the scene area corresponding to said image area, said controller being suitable for modifying the respective sizes of the various areas of the final image based on the value selected for the angular field of the final image, and in that the sensor having the highest angular resolution of the sensors is a monochrome sensor, the other sensors being polychrome, the controller being suitable for applying the chrominance of the central part of an image obtained from a polychrome sensor to the central area of the final image. - a plurality of image (120, 130) sensors (2, 3, 4) observing the same scene having a common sighting direction, and different angular fields and resolutions: - an output medium for processing a final image consisting: ∘ in a central area of said final image, of an image obtained from the sensor having the highest angular resolution of the sensors; ∘ in a peripheral area, of a peripheral part of an image obtained from a sensor having the lowest angular resolution; ∘ in a central area of said final image, of an image obtained from the sensor having the highest angular resolution of the sensors; ∘ in a peripheral area, of a peripheral part of an image obtained from a sensor having the lowest angular resolution; - an angular field selector suitable for enabling a user to select an angular field value for the final image, - a controller suitable for forming the final image corresponding to this angular field value based on the images obtained from the various sensors ∘ parts of images obtained from the various sensors and used for forming the various areas of the final image corresponding to sensors having a decreasing angular resolution from the central area to the periphery of the final image, ∘ said controller using, for each area of the final image, a part of an image obtained from the sensor having the highest angular resolution of the sensors observing the scene area corresponding to said image area, ∘ parts of images obtained from the various sensors and used for forming the various areas of the final image corresponding to sensors having a decreasing angular resolution from the central area to the periphery of the final image, ∘ said controller using, for each area of the final image, a part of an image obtained from the sensor having the highest angular resolution of the sensors observing the scene area corresponding to said image area,