Manufacturer/Model: Carl Zeiss Jena blc U-Boat 3rd model 7X50 Field of View: 7.3 deg = 128 m/1,000 m; APFOV 51 deg Weight: 1,720 gr Exit Pupil: 7.14 mm Serial #/Year of Manufacture: 61370 = Probably 1944-1945 Notes: The only markings on this binocular are “7X50” over “61370” over “blc” on the right prism plate underneath the rubber armor. “blc” is the German wartime code for. Carl Zeiss Binoculars Serial Numbers Long time before, almost a century ago, 8x30 binoculars of Porro prismdesign had already reached quite a reasonable performance level. Thiswas so because 8x30 was about to establish itself as one of thestandard sizes in military applications, at least in Europe, and there has always been plenty of money.
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Where can i see the lists of zeiss serial number with dates of manufacture? The lens: Carl Zeiss Jena D.R.P Anastigmag 195/9 84984 Carl Zeiss Jena series Ic 180/4,5 399520 Carl Zeiss Jena Tessar 135/4,5 2131960 Carl Zeiss Planar 80/2.8 4120253 Carl Zeiss Jena Tessar 250/4,5 5637142 Carl Zeiss Jena DDR Tessar 300/4,5 3538. Apr 21, 2019 Carl Zeiss Binoculars Serial Numbers Long time before, almost a century ago, 8x30 binoculars of Porro prismdesign had already reached quite a reasonable performance level. Thiswas so because 8x30 was about to establish itself as one of thestandard sizes in military applications, at least in Europe, and there has always been plenty of money.
Carl Zeiss Jena Deltrintem 8x30
The Carl Zeiss Jena Deltrintem 8x30 binoculars and its individual focus version, known under the name of Deltrentis, were produced in Jena from 1920 to 1990 practically without cease.Carl Zeiss Jena Binoculars
These are classic Porro prism instruments with achromatic objectives. At first these binoculars contained 4 lens-elements ocular without any antireflection coatings. During the WWII one layer of magnesium fluoride coating was put on air-to-glass surfaces. In 1947 the ocular was replaced by an Erfle design with 5 lens-elements which was supposed to provide a wide field of view with minimum distortion level. In 1978 the producer started to use new multilayer coatings with the characteristic orange-purple hue.
Around 1990 when the Jena plant was taken over by the Docter company, the binoculars not only didn’t go out of production but even were given improved multi-coatings. Its production, already under the Doctor brand name, ceased only ca.1995.
The specimen we’ve tested is marked with a serial number of 6206318 which means it was produced in 1985 and, being so, it already boasts newer multilayer coatings. You can find a narrow strap and a small soft case included with the binoculars.
Manufacturer:
Carl Zeiss Jenaweb site
Distribution / Sales:
komis, gie³da, aukcjeweb site
Magnification | Lens diameter | Angular field of view | Prisms | Eye relief | Weight | Price |
---|---|---|---|---|---|---|
8 | 30 | 150/1000(8.5o) | Bak-4/Porro | ? mm | 520 g | 400 PLN |
Real front lens diameter | Left: 30.05+/- 0.05 mm Right: 30.05+/- 0.05 mm | 8 / 8.0 pkt | ||
---|---|---|---|---|
Real magnification | 8.02+/- 0.15x | 3/3.0 | ||
Transmission | 92.2+/- 1.5% | 20/25.0 | ||
Chromatic aberration | Good to average correction in the centre, not very high at the edge. | 6.5/10.0 | ||
Astigmatism | Slight. | 6.3/10.0 | ||
Distortion | The distance of the first curved line from the field centre compared to the field of view radius: 31% ± 3% | 3/10.0 | ||
Coma | Quite significant, especially at the very edge. | 4.8/10.0 | ||
Blurring at the edge of the FOV | The blur occurs in the distance of 64% ± 5% from the field of view centre. | 1.5/10.0 | ||
Darkening at the edge the FOV | Between medium and low. | 3.8/5.0 | ||
Whiteness of the image | Distinct yellow. The transmission curve peaks sharply near 550 nm. | 1/5.0 | ||
Collimation | Perfect. | 5/5.0 | ||
Internal reflections |
| 2.3/5.0 | ||
Housing | A classic Porro set of binoculars with an ocular bridge. Comfortable to hold. Eyecups a bit too small and not regulated. The binoculars is neither waterproof nor nitrogen-filled. Light and handy. | 7/8.0 | ||
Focusing | Small central wheel (full turn of 400 degrees). It moves smoothly and evenly. You can’t defocus by applying pressure on eyepieces. The bridge has a slight lateral “play”. Individual focusing on the right eyepiece. It moves the outer lens. | 4.1/5.0 | ||
Tripod | Lack of tripod exit. In our 8x32 binoculars test we granted all the instruments the average mark of 1.5 points as in the case of the equipment of this class a tripod adapter is rarely used. | 1.5/3.0 | ||
Interpupilary distance | from 47.3 to 76mm | 6/6.0 | ||
Closest focusing distance | 1.9 m | 1.5/2.0 | ||
Eyepieces FOV | Apparent field of view of 67.5 deg (according to simple formula) and 61.1 deg (according to tangent formula). | 15/20.0 | ||
Field of view | Measured by us amounted to 8.42 ± 0.03 degrees and was a bit smaller than in the specifications. A very big field of view for this parameters’ class. | 7.5/8.0 | ||
Quality of the interior of the barrels | Inner tube black, corrugated and slightly shiny inside. Grey bottom. You can see neither glue nor screws. Isolated specks of dust on prisms. | 3.2/5.0 | ||
Vignetting |
OL: 3.2%, OR: 4.1% | 3.5/8.0 | ||
Prisms quality | Good quality BaK-4. | 8/8.0 | ||
Antireflection coatings | Bluish on eyepieces and prisms. Orange-purple on objective lenses. Medium instensity. | 4.5/5.0 | ||
Warranty [years] | 1 | 1/6.0 | ||
Final result | 67.4% | 128 / 190 pkt | ||
Econo result | 0pkt. |
Summary
Pros:
- classic and solid casing,
- very wide field of view,
- high transmission level in the middle of the visible spectrum,
- slight astigmatism,
- chromatic aberration quite well-corrected,
- eyepieces can be set very wide apart,
- good quality of BaK-4 prisms.
Cons:
- significant blur at the edge of the field of view,
- distinctly yellow image,
- noticeable distortion,
- a lot of flares from the areas near prisms,
- small eye relief,
- slightly truncated pupils.
Our 8x32 class binoculars test couldn’t lack classic Zeiss devices from Jena. There were so many of them produced over the years that you can still find many well-cared-for specimens on the secondary market, available at a very affordable price - from around 50 to 150 Euro. While testing this pair of binoculars we were stimulated not only by sheer curiosity how an instrument produced 20 or 30 years ago compares with contemporary products but also by deep belief that it can outperform many devices currently produced in China. Time for a reality check.
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Let’s start with evident advantages. The tested set of binoculars is 25-year-old. Despite some abrasions on the casing, being a result of ordinary wear and tear and more specifically frequent taking off and putting into the case, it is in a very good shape – we found no serious scratches or dents. Its optics is even in a better shape than the casing. The lenses are clean and flawless, without any mould inside. There are some specks of dust on the prisms but it is quite understandable taking into account the age of the device. Its condition places the workmanship quality in a very favourable light – after next twenty five years the Deltrintem 8x30, tested here, will look still the same, providing it is used in a similar way of course. I doubt whether any contemporary product made in China and bought for a sum not exceeding 250 Euro is able to survive equally well even a much shorter period of time.
The next advantage is the field of view. Once a huge field of view counted a lot and the Deltrintem boasts such a feature. It is almost by half a degree wider than the widest field of view found in contemporary competitors, even those very reputable.
The set of binoculars corrects astigmatism and chromatic aberration quite well. You can’t complain about the coma level too much either. The parameters, given by the producer, are followed with perfect exactitude – the objective lens’s diameter and magnification are in accordance with the numbers in documentation.
The classic Porro prism construction, not many optical elements and multilayer coatings made the transmission in the middle of the visual spectrum rather high, amounting to 92-93%. This result is very good – in fact other cheaper roof-prism instruments can only dream of it.
The colour fidelity can be a problem, though. In the 80s of 20th century the coatings were already multi-layered but still optimized only for the centre of visual spectrum. It had the effect which can be witnessed here - the transmission for yellow light is high but for blue and red it becomes even by 20% worse. As a result the image is seriously yellow.
As we’ve already passed to disadvantages, we must also mention the other negative points. The edge of the field of view, which is not sharp enough, and noticeable distortion can be certainly counted among them. What’s more, the usage of such wide-angle eyepieces made the exit pupils distinctly truncated.
Nowadays, most of binoculars, even those cheaper ones are waterproof and nitrogen-filled. In the case of the Deltrintem 8x30 we can’t count on that.
To sum up despite the passage of time the Deltrintem 8x30 seems to be still a very interesting option. Although you can get a bargain, usually you must pay for this device about 80-100 Euro, sometimes even 130 Euro. For such an amount of money you would be hard-pressed to find a really good 8x30 or 8x32 alternative so the Jena product is still attractive.
The risk, involved in purchasing anything on the second hand market is an issue, though. It happens very often that a set of binoculars touted by its seller as “in perfect condition” can be hardly described as such. This bad practice is notoriously common. As I needed to buy a lot of items on Allegro and e-bay to perform this test among other things, I could cite plenty of interesting cases from my own experience – I might be even tempted to write a separate article about it. Let me just state here that sometimes I drove to a seller just to have a look at a Jena pair of binoculars which had been touted as perfect only to find out that it was in appalling state – completely uncolimated or with huge amount of mould inside. Fakes are also a problem and the ingenuity people use in this area is really unlimited. Some cases I have seen decidedly deserve a place in the article I mentioned above.
Anyway if you decide to buy something on the second hand market you must give it your full attention – otherwise you might end up sending your bargain purchase to an optics specialists and paying extra money for repair or cleaning. I do recommend buying only from sources you can rely on and the direct contact is always the best.
Legendary binoculars - Carl Zeiss Jena Deltrintem 8x30
1. Carl Zeiss Jena Deltrintem 8x30 - 1920-1990
In our series of articles concerning legendary binoculars the products of the Eastern Germany Zeiss had a place practically guaranteed. Their factory was situated in Jena (an then in Eisfeld not far away from that city). Perhaps, in the eyes of people from Western Europe or the United States of America, they didn’t produce the best pairs of binoculars but still their price/quality ratio was excellent. In the Eastern Block, however, you can talk about a phenomenon of those instruments as they were wildly popular. If you lived behind the Iron Curtain during the Cold War you could only dream about binoculars produced by such companies as Leitz, Zeiss Oberkochen, Nikon or Swarovski. If you earned typically 10-20 USD a month, a device costing several hundred dollars was definitely outside your financial reach. Only few could spend an equivalent of their yearly income, or even an income from even several years, on a set of binoculars. For a change Porro instruments produced in Russia, (BPC), Poland (PZO), Czechoslovakia (Meopta), Bulgaria (OMZ) or Romania (IOR) were quite available and popular. Their quality might have left a lot to be desired but their price was affordable. Still if you wanted to own better equipment you had to think about a Zeiss from Jena. Optically it was the best device offered in the Communist Block for a more or less normal amount of money; in other words these were binoculars you could dream of with a real hope that one day those dreams would actually come true. After the purchase you could enjoy an instrument just slightly worse than the best binoculars available on the market.The Carl Zeiss Jena Deltrintem 8x30 binoculars from 1939. |
When you already talk about Jena products it would be difficult not to mention the 8x30 model, perhaps one of the most forged pair of binoculars of all time. Saying ‘forged’ I mean the widest sense of that word. The fakes including the full name of the lens and the Carl Zeiss logo were quite popular. Additionally that particular model inspired a vast array of products coming from the Eastern Block and from the Western Europe as well.
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Carl Zeiss Jena Serial Numbers
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The Carl Zeiss Jena Deltrintem 8x30 with original box and a dedicated casing. A 1939 model. |
It all started in 1920 so in an era when all Zeiss binoculars were produced in one place. The 8x30 model was launched at that time exactly, already in two versions, with individual focusing (Deltrentis) and central focusing (Deltrintem).
A page from the 1923 Carl Zeiss catalogue, presenting the Deltrentis 8x30. |
The binoculars were a small, classic instrument with an achromatic objective lens (a glued crown and flint glass doublet) and type I Porro prisms with air between them. As the eyepiece they decided to use a wide-angle (68 degrees) Koenig system consisting of four elements but positioned in just two groups (3+1). Such a small number of air-to-glass surfaces was a norm in those times. There were no antireflectiion coatings so fewer air-to-glass surfaces meant higher transmission. The original optical construction of 8x30 models featured as many as 10 air-to-glass surfaces. Taking into account losses of light on every surface amounting to about 4.5% the transmission of the whole system didn’t exceed 63%.In reality it was significantly lower than that because the light absorption in older types of glass was higher, especially when it comes to blue light. The real transmission values of 6x30 and 8x30 binoculars produced before II WW reached just 40-50%.
4-element Koenig eyepiece, from Deltrentis and Deltrintem models produced in 1920-1947. |
The original Koenig construction was presented in 1915 and consisted of three elements (2+1). It provided a well-corrected field of view of 55 degrees and a quite comfortable eye relief for those times. The modification of the Koenig eyepiece, increasing the number of elements to four, allowed to widen the useful field to 60-70 degrees and correct the distortion well at the same time. Small wonder such an efficient solution was adopted for the Deltrintem and Deltrentis binoculars.
Deltrentis and Deltrintem 8x30 models as presented by the 1931 Zeiss catalogue. |
When it comes to the weight of the models, described above, there are a lot of ambiguities. According to the Zeiss binoculars list published on Home Europa web page at the very beginning the metal casing was very heavy for 30 mm class instruments; the Deltrentis and the Deltrintem models weighed respectively 702 grams and 742 grams so as much as contemporary instruments featuring 40-42 mm front lenses and a heavy rubber armour. In 1928 the casing was redesigned with magnesium composites and their weight decreased. Home Europa states that after those changes the Deltrintem weighed 400 grams and the Deltrentis 390 grams. Still those numbers don’t match official data from catalogues.
The Carl Zeiss Jena Deltrintem 8x30 produced in 1969. |
A 1923 leaflet states that the Deltrentis weighted 645 grams and the Deltrintem 700 grams. A 1928 catalogue, published in the year of the casing change, features respectively 585 and 665 grams. Exactly the same values you can find in a 1931 catalogue. Still the real weight of the 1939 Deltrentis from my private collection amounts to 416 grams.
The 1969 Carl Zeiss Jena Deltrintem 8x30 with orginal box and case. |
After the war that strange situation concerning the weight normalized a bit. All available catalogues (two from the 50s, one from the 60s and one from the 80s of the twentieth century) state the same weight: 510-520 grams for all three models so the Deltrentis, the Deltrintem and the Jenoptem.
In 1935 an Ukraninan physicist Olexander Smakula working in Germany discovered that if you put on a lens a very thin layer of a substance which refraction index falls between the refraction indexes of air and glass, the amount of light reflected from an air-to-glass surface decreases notably. It was the beginning of one-layer antireflection coatings T (from the word Transparenz) which were used for the first time in binoculars during II WW. Some sources (e.g. marketing material published in Polish by Carl Zeiss Jena in the 50s of the twentieth century) state that the first instruments with such coatings were launched on the market already in 1937. The 1939 Deltrintem, presented in photos, doesn’t have any antireflection coatings so you might assume that the first Deltrentis and Deltrintem devices with such coatings on elements and prisms appeared after 1939. As the coatings of that time reflected about 1.5% of light on one air-to-glass surface the transmission of described binoculars in the centre of the visible spectrum increased from about 50-60% to about 70-80%. Skyrim pc game save editor. It was a huge leap forward, that difference made the image sharpness and its contrast far better.
Carl Zeiss Binoculars Serial Number Lookup
The Deltrentis and Deltrintem 8x30 models as presented by the 1952 Carl Zeiss Jena catalogue. |
After the capitulation of Germany in May 1945 Jena fell in the hands of Western Allied Powers. A part of the factory equipment was taken to Stuttgart. Eventually Jena was included in the Soviet Occupation Zone and became a part of the German Democratic Republic. Russians took another part of equipment as war reparations and the rest became a base of the VEB Zeiss Jena conglomerate which started the production of binoculars after a while. At first the production volume was low, with years (e.g. 1948) when not even one pair left the assembly line. However, at the end of the 40s and at the beginning of the 50s of the twentieth century the company started to run at full steam and soon the production reached several thousands of binoculars a year. Among that number the Deltrintem and the Detrentis devices, along the 7x50 and the 10x50 models, constitute the core of their offer.
A 5-element Erfle eyepiece used in the Deltrintem, Deltrentis and Jenoptem 8x30 models from 1947. |
Before the production was in full swing 1947 brought another very serious change. The wide-angle Erfle eyepiece had been known since 1917 and used successfully in 10x50 Zeiss devices. Right after the war 8x30 models included that construction as well. With lens coatings the 2+1+2 set with as many as six air-to-glass surfaces wasn’t such a huge challenge as in times before the war, when coatings hadn’t been known yet.
The 1952 optical and mechanical construction diagram of the Carl Zeiss Jena Deltrintem 8x30, after implementing the new, 5-element Erfle eyepiece. |
Huge astigmatism was the basic flaw of the Erfle construction so that type of eyepiece was unsuitable for instruments at high powers. Still it was the only serious flaw, not especially applicable in binoculars which usually are low power instruments. The eyepiece performed well in such models as the Dekarem and the Dekaris 10x50 so applying it to 8x30 models was more than reasonable. The Erfle eyepiece provided a field of view exceeding 60 degrees, well-corrected when it comes to most optical aberrations, and a sensible eye relief as well. The overall image quality improved, especially when compared to the older Koenig system. The increase of distortion was the only negative change.
A page from the 1985 Carl Zeiss Jena catalogue describing the Deltrintem 8x30 and the Jenoptem 8x30 models. Source: H. Merlitz. |
In the 50s and the 60s of the twentieth century the Jena factory was producing several tens of thousands binoculars a year. The demand was so high that in the 70s the production was actually increased, exceeding a hundred thousand of pieces in many years of that decade. 1978 brought another change concerning optics – the multi-layer T3M coatings. One-layer magnesium fluorite coatings used in previous years were characterized by blue reflections from elements; the T3M coatings were orange-pink for a change. They managed to improve colour rendering (the image was less yellow) and raised the transmission level. In the centre of the visible spectrum the binoculars were able to deliver 90-92% of light which is a very good result even by contemporary standards. With 12 air-to-glass surfaces it means the loss was just of 0.6-0.7% on one of them. Still it was true only for green-yellow light. For red and blue-purple light the transmission was much worse so Jena pairs of binoculars still warmed the colours giving the images a yellowish hue.
Transmission graph of the Carl Zeiss Jena Deltrintem 8x30 produced in 1985. |
Serial Number Carl Zeiss Binoculars Price
The introduction of multi-coatings made Jena products even more popular – in 1980 the record number of 471320 pairs of binoculars left the assembly lines. 1983 was second most efficient production year, with 373300 models released on the market; in 1988 there were 260300 pieces of binoculars produced.
The Jenoptem 8x30 and the Deltrintem 8x30 – both produced in 1985. Find-a-difference type of a riddle. |
The turn of the 70s and the 80s brought changes in the 8x30 line-up. Next to the Deltrintem and the Deltrentis you see a new Jenopten which, at first glance, doesn’t differ much from the Deltrintem. You can find info that the Jenoptem was aimed more at the civilian market and the Deltrintem was for the armed forces. It’s difficult to say whether it was true or not. The Deltrentis was actually designed for the military purposes, equipped with an individual focusing system on every eyepiece; it was used not only by the army but also by secret services (including the GDR’s Stasi). Even today you can find used Deltrentis models marked as MdI (an abbreviation from Ministerium des Innern, Minstry of Interior in English).
A page from the 1980 Carl Zeiss Jena catalogue presenting the Jenoptem series - the 8x30, the 7x50 and the 10x50 models. Source: H. Merlitz. |
The Carl Zeiss Jena 8x30 binoculars were most certainly produced till 1990. It is also possible that some specimens were released in 1991 as that year over 5000 binoculars left the assembly line with the widely popular, world-wide known logo. The same year, however, the Berlin Wall fell and the claims of the Western Zeiss branch, the legal heir of the whole achievements of that company, meant the Jena plant lost the right to use the Zeiss logo. Nature doesn’t like void; almost exactly at the same time (1 August 1991) the factory with 550 workers was bought by Bernhard Docter and renamed into Docter-Optic-Eisfeld GmbH. The production was continued, only the name of the binoculars changed into Docter Optic. That’s why at the beginning of the 90s of the twentieth century the old, good Deltrintem 8x30 could be bought as the Docter Optic Classic 8x30.
What’s interesting, at first a number of Deltrintems, released on the market, had the Carl Zeiss Jena logo on the one side and the Docter Optic on the other. With time the binoculars offered by Docter got completely new and much more efficient antirelection multilayer coatings which improved their optical properties in a significant way. Also some slight design modifications were introduced (e.g. rubber eyecups in the 8x30 and the 7x50 models).
X-ray photo of the Carl Zeiss Jena Deltrintem 8x30 binpculars. Phot. Obserwatorek. |
The last specimens of the Docter Optic Classic 8x30 were produced in 1995. That year Bernhard Docter went bankrupt and the company decreased its production looking for a potential buyer. In 1997 they were bought by the Analytik Jena GmbH but it is a material for another story.
A page from the Docter Optic catalogue with the Classic series binoculars. Source: H. Merlitz. |
During 75 years of almost incessant production, from the first 1920 models to the last 1995 Docters Cassic, several million of 8x30 devices found their way to shop shelves. Even if you don’t add the fakes to the numbers that volume undoubtedly makes them the most popular pair of binoculars in history. Its presence in the ‘Legendary binoculars’ series was obligatory and I am very glad this part was dedicated to that extraordinary product.
Docter Classic 8x30 binoculars. |
The 1985 Carl Zeiss Jena Jenoptem 8x30. |