Back button focus lets you precisely focus on minute areas and then not lose focus when an object comes in between the camera and the subject. There are no worries about holding your finger halfway down to keep the focus locked, and waiting, waiting, waiting in that position for your subject to do something interesting. ... pressing the shutter button halfway to focus on a still subject will lock the focus on that subject. There are certainly many times where the standard method of operation — press the shutter button halfway down to focus, and then press fully to shoot — works perfectly well. In the default focusing method, with each press of the shutter button, your camera refocuses, but with back button focusing, the camera only focuses when the back button is pressed, not when the shutter release button is pressed. The feature is now available on all current and many previous EOS models. Now, you’re in-focus, and ready to fire the shutter whenever the decisive moment happens. Go back to Custom Settings menu on your camera and then the Controls section. Even if at first its operation seems unorthodox, in fact it can simplify certain types of shooting and allow you to work more quickly with fewer missed shots. Some mid-range and high-end EOS models have a separate, dedicated button labeled AF-ON. Posted by 3 years ago. Custom Functions are totally locked out if you’re in the full-auto “green zone,” or a picture-icon setting like the Portrait mode or Landscape mode. Less risk of focus error with moving subjects. See your browser's documentation for specific instructions. That way, focusing errors can be minimised. For Canon Kiss X50 X70 X80. It’s no longer just for pros — any photographer can experiment with it and benefit from it in certain conditions. In the … Once BBF is set up, it does [not] matter which focusing mode you use. With back-button AF active, you can use AF to get you initially sharp on your subject, lift your thumb off the back-button to halt AF in its tracks, and then make fine manual adjustments — again, knowing that when you touch the shutter button to take the first picture, AF won’t activate on its own, and try to change the focus you just painstakingly set. With back button focus, the two tasks are accomplished using two different buttons. I use the center AF point because it is the most accurate. Re-compose the shot as you desire — in this case, it was moved far off-center. In sports, for instance, it’s common for a referee or another player to come between the camera and an athlete being photographed. Here, the initial Custom Controls menu shows the shutter button highlighted, meaning the user can go a level deeper into this menu, to change what happens when the shutter button is pressed halfway. Thank you David. Javascript is disabled in this browser. This could be advantageous for photographers who shoot wildlife, weddings and sports when they have to switch between continuous and single autofocus and this can be done by pressing the back button without having to take the eyes off the viewfinder. And if you want to touch up focus, or totally over-ride what the AF is doing, just pull your thumb off the rear button and turn the lens’ focus ring. This may still be the most convenient operation for many users, but if you’ve ever had AF inadvertently try to activate and re-focus after you’ve carefully focused on an off-center subject, or had it re-focus on an obstacle appearing momentarily between you and the subject during action shooting, back-button AF activation may be the solution. Once the obstruction is out of your way, you can immediately pick up your primary subject by pressing your thumb on the back button again. 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