Carl Zeiss Jena lenses Issue date by serial number:: Lenses:: Home:: LENSES-STICKY. Jun 10, 2009. A pair of 1955-1958 vintage Carl Zeiss Jena Deltrintem binoculars. Serial Number: 4013XXX Approximate Dimensions: 6' x 4-1/2' Made in DDR/Germany! These binoculars are in excellent condition. I rate these 95% or better. The glass is clean with no scratches. These binoculars work well. It has been claimed quite frequently that the late versions of the Zeiss Jena Jenoptem, those made in the 1980s, were of inferior mechanical construction. Despite of these impressive numbers, the demand for Zeiss Jena binoculars was even higher, because they were reasonably good and their price tags were, after. 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. 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. Komatsu forklift year by serial number. 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. Pavtube bytecopy serial download cable. 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. Carl Zeiss Jena Deltrintem 8x30 Binoculars Serial Numbers6.5/10.0 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.
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