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29.08.13, 12:10
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źródło (http://2.static.img-dpreview.com/files/news/6389121961/120/olympus_75.png?v=2460)It's an open secret that many compact cameras are produced by OEMs - companies that produce large numbers of products that are then sold under other brand names. Tamron, for example, builds lens/sensor modules that form the basis of many compacts. Companies such as Asia Optical and Sanyo DI Solutions build compacts that are then sold under a range of brand names. The practice isn't confined to compacts, though, with distinctly Tamron-esque (http://www.dpreview.com/products/tamron/lenses/tamron_18-200_3p5-6p3_di_iii_vc) lenses appearing in big brands (http://www.dpreview.com/products/sony/lenses/sony_e_18-200_3p5-6p3_le)' lineups, for example. But we were still surprised to read about Sigma's latest patent for a 75mm F1.8 prime lens...
The patent, highlighted on the egami (http://translate.google.com/translate?hl=en&sl=ja&u=http://egami.blog.so-net.ne.jp/2013-08-28&prev=/search%3Fq%3Dhttp://egami.blog.so-net.ne.jp/2013-08-28) blog, shows the details of a 75mm F1.8 prime, specifically designed with a lightweight internal focus element to allow fast focusing for stills and movies. That's a combination of features that sounded somewhat familiar.
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źródło (http://3.static.img-dpreview.com/files/news/6389121961/Patent-2.png?v=2460)
Sigma's patented 75mm F1.8, 10 element, nine group lens design
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źródło (http://1.static.img-dpreview.com/files/news/6389121961/Olympus.png?v=2460)
The 10 element, nine group design used in the Olympus m.Zuiko 75mm F1.8
And, while that could be because it's essentially a text-book definition of how to design a high-quality lens for contrast detection AF systems, a look at the optical formula diagram offers more convincing evidence to support the idea that Sigma designed the Olympus m.Zuiko 75mm F1.8 (http://www.dpreview.com/products/Olympus/lenses/olympus_m_75_1p8) - one of the best lenses for the Micro Four Thirds system.
Więcej... (http://www.dpreview.com/news/2013/08/29/did-sigma-design-the-olympus-m-zuiko-75mm-f1-8)
źródło (http://2.static.img-dpreview.com/files/news/6389121961/120/olympus_75.png?v=2460)It's an open secret that many compact cameras are produced by OEMs - companies that produce large numbers of products that are then sold under other brand names. Tamron, for example, builds lens/sensor modules that form the basis of many compacts. Companies such as Asia Optical and Sanyo DI Solutions build compacts that are then sold under a range of brand names. The practice isn't confined to compacts, though, with distinctly Tamron-esque (http://www.dpreview.com/products/tamron/lenses/tamron_18-200_3p5-6p3_di_iii_vc) lenses appearing in big brands (http://www.dpreview.com/products/sony/lenses/sony_e_18-200_3p5-6p3_le)' lineups, for example. But we were still surprised to read about Sigma's latest patent for a 75mm F1.8 prime lens...
The patent, highlighted on the egami (http://translate.google.com/translate?hl=en&sl=ja&u=http://egami.blog.so-net.ne.jp/2013-08-28&prev=/search%3Fq%3Dhttp://egami.blog.so-net.ne.jp/2013-08-28) blog, shows the details of a 75mm F1.8 prime, specifically designed with a lightweight internal focus element to allow fast focusing for stills and movies. That's a combination of features that sounded somewhat familiar.
https://forum.olympusclub.pl//brak.gif
źródło (http://3.static.img-dpreview.com/files/news/6389121961/Patent-2.png?v=2460)
Sigma's patented 75mm F1.8, 10 element, nine group lens design
https://forum.olympusclub.pl//brak.gif
źródło (http://1.static.img-dpreview.com/files/news/6389121961/Olympus.png?v=2460)
The 10 element, nine group design used in the Olympus m.Zuiko 75mm F1.8
And, while that could be because it's essentially a text-book definition of how to design a high-quality lens for contrast detection AF systems, a look at the optical formula diagram offers more convincing evidence to support the idea that Sigma designed the Olympus m.Zuiko 75mm F1.8 (http://www.dpreview.com/products/Olympus/lenses/olympus_m_75_1p8) - one of the best lenses for the Micro Four Thirds system.
Więcej... (http://www.dpreview.com/news/2013/08/29/did-sigma-design-the-olympus-m-zuiko-75mm-f1-8)