I've got a question, I've just recently moved into the 5D, my 7D I have as a backup I am able to do a ISO expansion and get 100 ISO, I can't seem to get anything less then 200 ISO on my 5D.

My background isn't photog, its film, and most recently digital, 2K and 4K quality either from the RED or Phantom. That being said, I can only relate to so much from my world of video compared to phtog, so I'm still a noob.


Please if anyone knows, whats the steps to bring it to 100ISO, thanks.