« on: January 16, 2013, 12:46:00 PM »
If you understood you would realize that the higher unusable max ISO rating they give will mean a higher usable ISO which means a cleaner low ISO. That is the way it works.
No, it doesn't, but marketing would people like to believe it does (sorry for the "good grief" though, I didn't want to offend you).
The max. selectable iso says absolutely nothing about usable or clean iso - take the 5d2->5d3->6d, the latter has the highest usable iso, but the older 5d2 has still the best (sharpest/dr-rich) low iso. And there's unfortunately no one stopping marketing from implementing a H4 mode @iso51200 for impressive tech specs, even though it's a noise generator unless downsizing to 320x200.