The AS80/840 was part of the "black-&-white" design line of telescopes sold by Zeiss Jena from the early 1990'ies. It was delivered on the (now rare) 2VS tripod that you also have, and optionally mounted on a T/TM or Ib/Ic.
Zeiss described the objective as a Semi-Apochromat BK7/KzF2 doublet with a secondary spectrum of 2.8 (which does not quite cut is as a half-apo, compared to the AS80/1200 that has a S2N=2.0, which is right at the upper limit of semi-apo). I believe Zeiss sold each AS80/840 with a test-report ("Qualitätsurkunde für Astro-Optik"), -- I have seen one such report with a strehl of 96.7%, but I don't know what was the mean Strehl value or how many of the AS80/840 scopes CZJ produced.
Edited by AllanDystrup, 03 May 2018 - 07:20 AM.