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 lenses appearing in big brands' 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 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.
|Sigma's patented 75mm F1.8, 10 element, nine group lens design|
|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 - one of the best lenses for the Micro Four Thirds system.
Aug 24, 2016
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Aug 25, 2016
Aug 25, 2016
- Fujifilm X-T223.6%
- Nikon D50025.4%
- Nikon AF-S 105mm F1.4E8.2%
- Olympus M.Zuiko 12-100mm F47.5%
- Panasonic Lumix DMC-G857.2%
- Sigma 85mm F1.4 Art6.7%
- Sigma 50-100mm F1.8 Art5.1%
- Sony a63006.4%
- Sony Cyber-shot RX10 III3.7%
- Sony Cyber-shot RX100 V6.3%
|Lighthouse, Bottom of the World by CelticOdyssey|
from An A to Z of Subjects- Week 12, L
|Dundrum by Rik Powdrill|