Beautiful Sunset over Columbia river (mp4 from camera)
4k video, 3840×2160 ultra UHD video, Camera is Sony AX100.
4k video, 3840×2160 ultra UHD video, export from Premiere as 2160p YouTube, Camera is Sony AX100.
The Sony AX100 does better in very high contract scenes like a sunset by using auto setting to get an approximate setting, then stopping down the ISO or DB setting.
Other Test Footage:
4k Sony AX100 4k test video 3840 x 2160 30fps – direct from camera
2k Sony AX100 2k test video 1920 x 1080 30fps – direct from camera
2k Nikon D3200 1920 x 1080 24fps – direct from camera
4k Sony after Premiere export as 4k 2160p YouTube
4k Sony after Premiere export as Match Original with High Bitrate
1k Sony 720p – Ringold WA on Columbia River 720p export from Premiere (1280×720 not HD)