Rangefinder coping with short distances - has emission optics in barrels positioned in large aperture receiving lenses offset from their optical axes

摘要

The instrument can be used in cameras, approach projecting devices, and level indicators. It has an optical system emitting a light ray to the target, and a receiving optical system at a distance from the axis of the former, receiving light reflected from the target. The receiving optical system has a greater aperture than the emitting system. Each lens of the receiving optical system (15, 16) has a hole eccentric w.r.t. its optical axis, in which an opaque tube is inserted, containing the emitting optical system.