Since we here can someone tell me what this button actually does. I know what multi function is but what functions does it actually control. When I press page 445 it skips to that page but ti does not really tell me anything. Unless you are holding it and trying it out it is not easy. That is the only thing that has me stumped a bit.
Hit the Q button, then bottom right corner is the Custom function button, scroll to desired button and hit enter - choices will come up. I use it for picture magnification. The button below that I set to AF function to put the camera into full turbo AF mode