Observation binoculars with night-binoculars attachment and combination of night-binoculars attachment with loose binoculars

摘要

For a night-binoculars attachment with 1X enlargement which can be detached from an optical day instrument, an observation instrument has been constructed, with a single objective 10, a beam splitter 13, 14, two eyepieces 16 and an image-turning system 11, 12. This is divided into a first part 11 before the beam splitter and second parts 12 after the latter, the construction being such that the intermediate image I of the objective is reproduced to infinity by the first part, resulting in it being possible for the eyepiece parts 12, 15, 16 after the beam splitter 13, 14 to be displaced for eye-distance adjustment without changing the focusing.