The reason it's only 2k vertically is 2k x 8k is 17MP. And although the 17MP is correct, the 8k is not. They're measuring their rotated pixels in a way that suits their marketing "k" figure, rather than one which properly describes what they're doing. As they're bayer, they have enough MP for 5.7k and that is all. They chose to arrange those pixels differently by rotating them, but it doesn't really alter things, other than to give them a magically unreal 8k figure to throw around and the lack of a need to demosaic, just extract, so no oversampling will be going on at all at their 4k.
Look what I just found:
New specs on pro sony com shows that F65 sensor have 4096x2160 green pixels so for 16:9 format you can use only 3840x2160 pixels so it is not very “honest” 4k but good enough.
“The F65 imager contains a total of 20 Mega-pixels. Half are sensitive to GREEN, and the other half are equally shared by RED and BLUE pixels. The sensor will provide pristine super-sampled HD and 2K images, and this is the first sensor in the industry that provides a dedicated green photosite for each pixel in the 4K (4096 x 2160) output image.”
Maybe that is why they are very careful and does not mention that sensor will provide HD and 2K and 4K images but they say that sensor will provide only “HD and 2K” images?
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