The five hundred mm (19.7 in) mirror telescope was setup on the outside in the observatory during the early nineteen sixties to interchange the enormous telescope, which was quickly shut down at enough time. This telescope is particularly well suited for the observation of so-identified as deep sky objects - https://sehensw-rdigkeiten-jena31974.mpeblog.com/40211401/a-review-of-planetarium-jena