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. 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.

Valuations: Post Reply Topic Search Topic Options. Many of those have the Japan inspection sticker and a 6 digit serial number, while all Jenoptems should have a seven digit number starting in 6 or 7. (West German) Carl Zeiss binoculars were allowed to be marketed as 'Carl Zeiss' binoculars in the USA during this time period. Carl Zeiss Binoculars Serial Numbers List of zeiss binoculars from 1894-1950 jena and 1954-1972 serial numbers: 1900 - 20,000 1904 - 60,000 1907 - 100,000 1911 - 250,000. The following is a collection of serial numbers for large format lens manufacturers. Serial Number. Carl Zeiss Jena Serial Numbers.

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.

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% 13.5/15.0 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 Left: Right: A lot of reflections from the area near prisms. 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 degrees. 8/10.0 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. You can see neither glue nor screws. Isolated specks of dust on prisms.

3.2/5.0 Vignetting Left: Right: Slightly truncated pupils. OL: 3.2%, OR: 4.1% 2.5/8.0 Prisms quality Good quality BaK-4. 8/8.0 Antireflection coatings Bluish on eyepieces and prisms.

Orange-purple on objective lenses. Medium instensity. Hp m7470n driver files download free. 4.5/5.0 Warranty [years] 1 1/6.0 Final result. 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.