Panasonic 4K Lumix Mirrorless Pre-production Camera on Display at CES 2014 | News | Forum
4k = 8mp or so of sensor data, 4,000 x 2,000 (round numbers) = 8,000,000
So 4k has nothing to do with a larger sensor MP wise. What would make sense is to make a sensor that has 35MP and a center scan area of 8MP for 4k. But be careful what you wish you, 4k takes up a lot of storage and takes a bit of computing power to edit.
But 4k alone doesn't say very much. Is it 10bit? 16bit? What is the DR? Compression / RAW? Showing a camera body with no info and saying it's 4k is ridiculous… it means they didn't get it done in time and are scrabbling to get it together as fast as possible. This could lead to great innovation or to short cuts – it depends on the corporate culture at their company.
I look forward to seeing the 4k future we are headed towards, but it's important to know what kind of 4k we are getting into
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