OMG, I rented a Canon 5D Mark lll for 1 day, when Erick wanted to go to the zoo and my Canon 50D was in the mainland for repair. It was fun with Erick, Sookie and her children. Sookie is getting the camera bug.
My ISO ranged from 500 - 25,600. ISO allows the camera to capture more light and to take faster pictures.
(One last note, due to me using another camera - the software I have did not recognize my "raw" files - which would mean I could not see the pictures.
Solution: import the pictures to iPhoto then export them as jpg. I then could see the pictures, edit them, and share them.)