The two optical systems held in the frame (3) consist of two photographing lens with lenses (4,5) and two mirrors (7,8). The camera housing contains a compound prism (11) consisting of at least two different fully reflective prisms symmetrically positioned to form a unified structure. The images incident through the two optical systems are composed into an upright image viewed with one eye. The compound prism compiles the upright image by symmetrically inverting the outer halves of the images of the image-parts of the right and left lens and unifying them into one image. The images incident through the two optical systems are fully reflected three times in the compound prism.
