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Panasonic (Click here) just announced a new sensor Technology for Highly Sensitive Image Sensors Using Micro Color Splitters. That new technique allows to “approximately double the color sensitivity in comparison with conventional sensors that use color filters.“. The trick to achieve that is the complete removal of the color filters that “usually block 50 – 70% of the incoming light before it even reaches the sensor“. Full description of the tech cna be read here: http://panasonic.co.jp/corp/news/official.data/data.dir/2013/02/en130204-6/en130204-6.html
I hope that’s the reason why Panasonic dind’t unveil the GX1 successor last year :)