PCT No. PCT/SE86/00334 Sec. 371 Date Mar. 19, 1987 Sec. 102(e) Date Mar. 19, 1987 PCT Filed Jul. 11, 1986 PCT Pub. No. WO87/00639 PCT Pub. Date Jan. 29, 1987.Method of designing a compact binocular night vision instrument with an electronic image intensifier (2) which is oriented so that its symmetry axis forms a right angle with the line of sight (19) between the night vision binocular and the scene to be observed. The total forward length thereby becomes particularly short, thus reducing the downward torque which is troublesome when the night vision binocular is carried like a pair of spectacles, attached to the head (generally called night vision goggles). The total forward length may be even further reduced if the symmetry axis of the objective lens (1) is also at right angles with the line of sight (19). These measures makes feasible a simple beam splitter system where the optical axis through one of the eye pieces (13B) intersects the common optical axis beam splitter (14), and to design an instrument enclosed in a single housing having a smooth exterior shape which is easy to grasp.
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