Even with a good light, if you take a still photography - at least in flight - the real resolution is nowhere near 21K, there is always this weird noise/image compression, no matter if you shoot with the best light and in raw format... Vibrations are the most obvious explanation of course, a gimbal on a quadrocopter is not the equivalent of a sturdy tripod, and the real resolution is only a fration of the sensor's. I sometimes use the Anafi to take vertical shots while hovering, and I first wanted to print a resolution test card for the Anafi, to place on the ground, and estimate the size of detail for different altitudes. After a good look at the image quality, I forgot about this idea !