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. 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. If you fail to do so you should be aware that we are going to process your data according to our Privacy Policy. You can switch cookies off by adjusting your browser settings so if you donât agree with our cookie policy please, change your browser settings or leave our website. Our partners might combine information, obtained on this site, with other data they get from you as you make use of their services while surfing the internet. Information about your browsing habits is shared with our social network, advertising and analytics partners. It’s field of view is not as wide as that of the Super-Nobilem 8×50 (see separate post, ×50/), but still quite impressive, and the image of the Octarem appears slightly brighter, the binocular is also easier to hold and the focus knob easier to operate than on the Super-Nobilem.As in the case of almost all other websites, cookies help us to personalize ads, offering you the most relevant information, allow you to share pages with social networks, make our services work as you expect and, overall, help us to monitor and improve our performance. Made only between 19, the Octarem was one of Carl Zeiss Jena’s top binocular models. * range of diopter adjustment not affected by position of focus wheel Weight (measured, with eyepiece cover and strap): 1‘072 g Range of diopter adjustment (estimate): +/- 4 dpt*Įxcess travel of focus wheel beyond infinity position (estimate): 4 dpt* Minimum focus distance (measured): 4.35 mįocus type: CF (direction of rotation from close to infinity: > clockwise)ĭegrees of rotation of focus wheel from 4.35 m to infinity (measured): 280 degrees Usable eye relief (measured from rim of eyecup): 15 mm
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