I just ran JG's linked article through Google Translate:
BINOCULARS FOR HOBBYASTRONOMERS
CARL ZEISS 15x60
with original quiver and binocular strap!
After WW II, many leading employees left the plant in Jena and large parts of it were dismantled. In 1946 a new production site was set up in Oberkochen.
In 1947 the name Zeiss-Opton was renamed to Carl Zeiss. Since then, a distinction has been made between "Zeiss-Jena binoculars" and "Zeiss-West binoculars".
Carl Zeiss binoculars are among the top products on the optical market worldwide.
From 1958 the model 15x60 with Porro I prism system was produced. It represents a top optical performance and is highly praised in astronomical circles.
At the beginning of the 80s it was modified with a rubber armouring and the improved T * coating.
The parameter is 15x60. 15x magnification with 60 mm objectives.
The serial number is 1397774.
According to Zeiss, the binoculars were manufactured in 1976.
The focusing wheel at the lower end of the articulated bridge.
Looking through the binoculars.
Width = 21 cm, height = 18 cm, weight = 1280 g.
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As far as eye-relief, I'd be curious to learn what it is on these ones that Terra is getting. I'm mildly far-sighted with a mild astigmatism, so I do wear eyeglasses. ER on my Docters -- purchased new by me in 2001 -- is 15mm, and I have no problem seeing the entire FOV.
My DOCTER Nobilem 15x60 B (G/A) are from the E series.
They have been redesigned by Albrecht Köhler with:
- New glass materials
- New multicoatings (I have counted 6 in total different reflected hues)
- New Porro-Abbe prisms assembly
The front lenses are the classical cemented doublets, the eyepieces might be the type of Erfle 2, even if I have not been able to ray trace all lenses in the EP.
These binoculars deliver a very high contrast with the typical Zeiss West colder color rendition, and a hard snap into the focus, unlike the softer snap of most of the other binoculars.
Taking the low surface brightness IC 342 galaxy (Maffei Group) in Camelopardalis as a differentiator for the binoculars performance, these DOCTERS have shown its full extension of about 20', and not just its small bright core.
Back to the Zeiss Oberkochen 15x60
Shortly after they have been discontinued, the prices have exploded into the range 3,700 DM up to 4,000 DM, actually what used to be the cost of a 2nd hand Volkswagen at that time.
The DOCTER Porros by Albrecht Köhler belong on the German markets of today, when in pristine condition, to the unavailables. I am still looking for some to complete my set.