As I'm starting to get into video I'm learning what video people think about cameras. I came across this odd thing where it is thought that ISO 160 (and multiples thereof) is actually better than ISO 100 on Canon cameras. This didn't make sense to me so I questioned it and was referred to the following articles http://photocascadia.wordpress.com/2...so-noise-test/ and http://kriskoster.com/2010/08/optimi...or-filmmaking/
It still didn't make sense though if you can be bothered reading the first article all the way through it starts to. The second article is just plain wrong (in respect to ISO at least).
It turns out that (with Canon cameras) ISO 100, 200 etc is the only hardware settings for ISO and that the other settings ISO 125, 160 etc are got by setting to ISO 100, in the case of 125, and applying an amplifier gain or 25%. ISO 160 is got by setting to ISO 200 and damping the gain by 20%. Thus the apparent noise increase or reduction.
See what you think of these articles and the mistakes you can make if you are not careful.