an aperture 56 at the center a second mirror 58 is also mounted on the stable body and is located to the side and adjacent the mounting ring 48 the mirror 58 comprises a well known mangin mirror and reflects energy through the aperture 56 to a second relatively smaller lens 60 which is also mounted on the stable body 38 and located behind the mirror 54 and orthogonal to the elevation axis 40 the two lenses 52 and 60 and the two mirrors 54 and 58 being mounted solidly on the stable body 38 are adapted to rotate about the axis 40 elevation the stable body 38 moreover is designed to have a peripheral slot 62 which accommodates an upwardly extending support structure 64 fig7 on the yoke 34 which supports a third mirror element 66 a pair of lenses 68 and 70 fourth and fifth mirrors 72 and 74 and a pair of output lenses 76 and 78 as best shown in fig4 these elements rotate only in azimuth and not in elevation the three mirrors 66 72 and 74 are comprised of generally flat faced reflectors which are tilted and angulated downwardly and operate in combination with the mirrors 54 and 58 to fold the received optical energy in an extremely compact gimbal package such an arrangement provides a magnification on the order of x11 of the incident image on the front.