Carl zeiss jena binoculars 3097708
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The next important modification was introduced by another Zeiss company worker. After the war its weight increased again to 1020 grams – such a value at least was officially given in the old catalogues. The change of alloys and the modification of its interior, conducted in 1936, made the binoculars slimmer and lighter, reducing its weight to 890 grams. With 10x magnification ratio the apparent field of view of the eyepieces amounted to as many as 73 degrees! In those times it was really a huge achievement even several years earlier a level of 50 degrees was seen as superb and all of a sudden that value was increased by over 20 degrees.Īt the beginning the Dekarem was physically heavy, weighing 1350 grams. The possibilities of the Erfle construction were utilized to their maximum and the binoculars offered a field of view of 7.3 degrees. The most impressive feature of both the Dekarem and the Dekaris was their field of view. That model was launched in 1931 and was produced, with some small modifications, incessantly during the next sixty years.Ĭarl Zeiss Jena Dekaris 10x50 with individual focusing appeared in 1929. The main character of this part of ‘Legendary Binoculars’ series, the Carl Zeiss Jena Dekarem, shares with the Dekaris the same optical construction but in its case it was closed in a casing with a classic ocular bridge and a central focusing wheel. It was a pair of binoculars with an individual focusing system. The Erfle invention opened up plenty of new possibilities before Zeiss constructors and they were promptly used – soon afterwards several models with a five-element eyepiece constructions were launched, among them the Carl Zeiss Jena Dekaris 10x50, shown to the world in 1929. The Erfle eyepiece corrected most of optical aberrations well and provided a field of view exceeding 60 degrees apart from that it also offered a sensible eye relief.
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Still it was its only serious drawback, not especially keenly felt in binoculars which are, after all, low powers devices. The main flaw of that construction was huge astigmatism that’s why the Erfle eyepiece wasn’t especially useful at high powers. The situation changed drastically in 1917, once again due to the Zeiss company or, to be more precise, due to one of their workers called Heinrich Erfle who invented a 5-element eyepiece consisted of two achromatic lenses and a single lens between them. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio only that way we will be able to continue providing you interesting content for free. If you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The eyepieces of first prism binoculars featured just two or three elements as a result their fields of view were quite narrow, amounting to about 50 degrees. A Porro prism assembly appeared in 1854 but it had to wait for a serious binoculars application till 1894, when the Zeiss company used it for the first time in such an instrument, starting a new era of optical constructions of binoculars. An achromatic objective lens was nothing new as its beginnings go back to the middle of the 18th century. The story of such an interesting and important set of binoculars as the Carl Zeiss Jena Dekarem 10x50 started in the 20s of the 20th century – only at that time all the parts, allowing a construction of such a device, were available. In a good optical instrument all those three parts cooperate harmoniously with each other, being good optical constructions in themselves. You can change your consents to the use of cookies at any given time.Īn optical system of almost every contemporary pair of binoculars consists of three parts: an objective lens which gathers the light, a prism assembly, inverting the image and an eyepiece, decisive when it comes to a magnification ratio and a field of view. In this document you can find more information concerning browser settings and the way we and our social network, advertising and analytics partners process your data.
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