The '50 megapixel' shot isn't 50MP: it's still 12.5MP (in the Nano class). The JPG output is interpolated data: that's why it looks fuzzier on the fine detail compared to the standard JPG: it's computer guess-work. The sensor still has 12.5 million photosites: it is just the filter that covers each if these INDIVIDUAL photosites (a QUAD Bayer) that is split into four quarters: RYYB (Red: Yellow: Yellow: Blue) on the Nano and the Lite. If it was a kosher 50 megapixel sensor: it would have 50 million photosites. The DNG physically cannot change to a higher resolution because the sensor is 12.5MP - that's all it can capture. A Bayer filter that ensures a sensor can capture colour imagery covers one photosite with one individually coloured filter in a matrix that covers the whole sensor (RGGB or RYYB). A QUAD Bayer (description above) claims 4 times the resolution, but this is not actual resolution.