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The single elements from that one perform about the same as the other. I have a slightly longer focal length B&L protar (combined) which is acceptable but isn't astounding. Goerz, Optical Works, Limited, 1.6, Holborn Circus. Its performance as single elements behind the iris is quite acceptable to me up to 16X20 prints from 5X7 negatives. An instructive booklet regarding the Goerz Trieder binoculars has been issued by Messrs C. I can say I have one B&L protar which is a combined 14 and 19 inch lens which is extradordinarily sharp by even modern standards when combined. Add in the fact that the lenses within and across company lines are ageing more or less gracefully with different imperfections in the surface glass and, especially, balsam separation, and I'm not sure a one on one modern test would mean much. You don't know if the two samples you test are representative of their own product line, either. (And why would you spend your money to acquire that, these aren't inexpensive lenses.) And even that one-of-a-kind test on just two samples doesn't tell you anything you can take and then apply to different samples, since the sampling is too small. So the question is which protar is being compared across company lines? Unless some historic sample to sample test data surfaces, you'd have to find someone who happened to have exactly the same lens in both product lines. CP Goerz DF03 Binoculars Trieder UF 19956 Dienstglas Berlin Leather Case B77. The triple convertibles, doubles, single elements with smaller diameters meant to be used behind an aperture, the f:18 wide angle series, etc., etc., etc. The variety of "protars" is considerable within company lines. A few other thoughts.I think this question is essentially unanswerable for a number of reasons. Considering the significance of the design the amount of information which can be found "web surfing" on this subject is minimal. Does this mean the B&L are made exactly the same way but measured differently? I don't know. The official focal lengths for the B&L's are slightly different than the Zeiss numbers, for example. A leather neck-strap is looped through the leather on each barrel. The triangular aluminum barrels have rounded edges and are covered with brown leather. ZZ.Ron: I have assembled some Zeiss and B&L official data and the specs per the manufacturers do not appear to be identical. This pair of German military binoculars is an early example of prism binoculars. Overall: 7 in x 4 1/2 in x 2 in 17.78 cm x 11.43 cm x 5.08 cm ID Number “DRP” refers to Deutsches Reichspatent, a term in use until 1945. They boasted that their Triëder binoculars were as “small as an opera glass” and “more powerful than the largest field glass.” They introduced the Helinox design in 1911. The firm began making Galilean binoculars in 1891 and prism binoculars in 1896. Goerz Optical Institute) was formed in 1890, and established a factory for military optics in Vienna in 1905. 5 Antique and Vintage 1920s Binoculars / Opera Glasses / Glasses For Sale - priced from £45 to £475. Leonard Wood, and were probably used by her husband, an eminent Army physician.Ĭarl Paul Goerz began in business in Berlin in 1886. These were given to the Smithsonian by Mrs. GOERZ / BERLIN-WIEN” and that on the right is marked “6x / HELINOX / TRIEDER-BINOCLE / DRP.” There is a center focus, and fine adjustment on each eyepiece.
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These two very small binoculars one for the Opera and one for the Races, dont display as luxery items. In the 20s small binoculars was very popular for various use, motor race, boating, horse races. The same body were 15 years later the carrier of a 6X Ross 'Vest Pocket' binocular. The eye end of the left prism housing is marked “C. 01-02-2017 - Ross London 'Deatron'.3X13 Opera Prism Binoculars. This is a black metal instrument with black leather covering the barrels that probably dates from the World War I period.