This tells you that you should never underexpose S-Log 3 because there is an apparent noise floor where if your shadows fall below that threshold, you will get large amounts of noise no matter how low your ISO is at. Therefore you should always over-expose about 1.7 stops above, to have the cleanest possible shot. Also, in S-Log 3, the cleanest/native ISO's are 640 and 12800 Thanks for the test!