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Note that - as with previous versions of the lens - the feet red and metres white distance markings continue to be shown on this lens, which was finished on 19th July 1978. Biometar 1971 After that the lenses were designed all in black, with a diamond or pyramid-shaped pattern on the focussing ring, but a bright metal front edge to the focussing ring. However, the changes were gradual presumably as parts were used up. Each time there was a style change, all the lenses within the range were made to the same cosmetic style. This 80mm Biometar was completed on 28 September 1971. The aperture selection ring was still plain metal with red numbers. For this lens the aperture index ring, the focussing ring and the whole of the filter ring were black. Biometar 1964 The 80mm Biometar illustrated here was completed on 29th November 1965. #Carl zeiss jena microscope serial numbers dates fruit crackWith rough handling it could easily crack or work loose, so a return was made to a leather band. One 1968 brochure also shows lenses with this finish, but the lenses must have been taken from earlier production runs, as the mostly-black lens style with a leather band on the focussing ring had entered production in 1965 - see the next section. Pentacon Six brochures produced in 19 show lenses with this finish. The very front ring, with the thread to accept filters, also now had a black front edge. The aperture selection ring continued to be plain alloy, with red numbers. It rather looks as though the manufacturers used up their stocks of leather bands before starting to use the plastic rings with the bumps - or perhaps the plastic rings were a component that was not ready at the beginning of the production run, a situation that regularly occurred in the post-war years in East Germany. The lens illustrated on the right here was part of that first production run. However, some of the lenses later in the same production run. The first 80mm Biometars for the Praktisix had the same cosmetic style as the Tessar illustrated above - mostly alloy, with a black leather focussing band. This had the same optical design as the 80mm Planar lens that was being produced by the West German Zeiss factory at about the same time. Tessar 1958 For the Praktisix a change of Zeiss lens on offer was made to the five-element Biometar, which was first produced in the Praktisix mount on 24th March 1959 earlier versions having been produced for the Rolleiflex and other cameras. However, the Meyer-Optik Primotar continued to be offered as an economical alternative for a number of years. ![]() The makers of the Praktisix decided that the camera would sell better if it had the option of a more prestigious standard lens than the four-element Tessar, although we should not forget that at the time the first Hasselblads were also being supplied in many markets with a Tessar lens. It would have been fitted to the original version of the Praktisix. When buying any camera with inter-changeable lenses, bear in mind that the lens may not be the one that was on the camera when it was new. Most Zeiss lenses other than the 1000mm mirror lens had the same design style, so when changes of styling were introduced, they were phased in to all other Zeiss lenses except the mirror lens. Over this period of time, various changes were made to the lenses. ![]() And Zeiss lenses to this day also remain available for use with many commercial products including copiers, photogrammetric cameras, comparators, etc. #Carl zeiss jena microscope serial numbers dates fruit codeA product type code reappeared in 1990, now in the form of a two digit code preceding the two letter date code.Īnd Zeiss lenses to this day also remain available for use with many commercial products including copiers, photogrammetric cameras, comparators, etc. ![]() Serial numbers therefor can only be used to date lenses if we have some way to link serial numbers to years. When there are three letters, the year of manufacture is always indicated by the first two. It would then be asked of a chemist to invent and manufacture those raw materials necessary to make the new designs possible. Link: => /d?s=YToyOntzOjc6InJlZmVyZXIiO3M6MzY6Imh0dHA6Ly9iYW5kY2FtcC5jb21fZG93bmxvYWRfcG9zdGVyLyI7czozOiJrZXkiO3M6MzY6IlplaXNzIHNlcmlhbCBudW1iZXIgcHJvZHVjdGlvbiBkYXRlcyI7fQ= ![]() #Carl zeiss jena microscope serial numbers dates fruit serial numberCarl Zeiss Jena lenses Issue date by serial number ![]()
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