. . "So those three numbers are the most important numbers when it comes to choosing my settings for taking a photograph.Now, some of these can be done for you and if you want to understand more about that have a look at my Av mode and my Tv mode videos and you will understand more about those. 125th of a second at F8, 125th of a second, if was to half that amount of time and make it 125th of a second," . .