I noticed something new today and it confuses me. This happened A/P/M/S mode at least and maybe more modes: If I press "Ok" in the circle dial, and choose "IS" option, in the bottom right corner it says 8MM (ATM). I can press "INFO" and change the number from 8 -1000. What should I do with it? Always write in the number of my focal length? Just ignore it? I'm confused.