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In the beginning, the company produced barometers, ophthalmic lenses and frames, scales, and various measuring instruments in its precision mechanics workshop. In 1880, Rodenstock developed his first patented products, the "Diaphragma lenses", and two years later he exported them to Austria, Switzerland, the Netherlands, Denmark, Italy and Russia.
A trial frame is a tool used by ophthalmic professionals like ophthalmologists and optometrists. It is basically an adjustable spectacle frame with multiple cells, used to hold corrective lenses, and other accessories in subjective refraction (finding the correct spectacle power) and retinoscopy.
DT lenses will not fully illuminate the sensor/film area of 24×36mm full-frame cameras. Three DT lenses were made and sold by Konica Minolta: 11–18, 18–70, and 18–200mm. G "Gold" series, Minolta's line-up of high-grade lenses. The "G" status does not occur as label on the lenses, but is indicated by a decorating ring on the lens. High Speed
Three of Minolta's Rokkor brand of lenses were made specially for the CLE: the M-Rokkor 28 mm f / 2.8 wide-angle, the M-Rokkor (-QF) 40 mm f / 2 standard, and the M-Rokkor 90 mm f / 4 telephoto. The earlier Leica CL 40 mm and 90 mm lenses had single coatings , and later Minolta CL-E versions of these two lenses, plus a 28 mm, were multi-coated ...
Vivitar Corporation is a manufacturer, distributor, and marketer of photographic and optical equipment originally based in Santa Monica, California. [citation needed] Since 2008, the Vivitar name serves as Sakar International's house brand for digital imaging, optics, mobile accessories, and audio products.
Wichterle's father Karel ,was co-owner of a successful farm-machine factory and small car plant but Otto chose science for his career. After finishing high school (today's Wolker Grammar School) in Prostějov, Wichterle began to study at the Chemical and Technological Faculty of the Czech Technical University (now the independent University of Chemistry and Technology, Prague) but he was also ...
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