The ISOs seriously need to be reset to the original progression, i.e., multiples of 16, 25, 32, 40, 50, 64, 80, and 125. There should be 1600, 2000, 2500, 3200, 6400, 125,000, 160,000, 200,000, 250,000, and so on. The crazy fractionalization is meaningless compared to the accuracy of the photo sensitivy. After all, the exact mathematically progressive increments (cube root of 2) are not used for the lower speeds.
EBH