I'd like to know where I can check if my Nikon D810 introduces more or less noise from using the expanded "Lo" ISO setting: ISO 32. There's already the topic Should I use low-end expanded ISO? on this website, but this doesn't help me figuring out whether I should use the low setting if I wanted more noise.
Some reviews argue that the low ISO setting exactly doubles the light information in the produced raw file for every pixel, suggesting it is a software-related trick, but something inside me hopes it's just a trade-off of DR for a cleaner image, and I like the sound of ISO32.