Options. 08-04-2016 10:59 AM. I am using my relatively new 5D Mark III with my old 400mm 5.6 lens for bird photography. It often will not grab focus. I have to manually focus closer before it focuses. It doesn't seem to matter which distance setting I use on the lens. So I am missing quite a few bird shots. I have no problem when using my old 7D. Sorry I didn't spell out 6D Mark II both times. I have that and the 5D Mark III. FAQ Sign In. Browse Canon Community. Discussions & Help. Printer. Desktop Inkjet I wondering how auto focus goes with the 5DIV at F8. It says work better than 5DIII. Also how is the 1,4xIII on the lens, I had II, it was not very good. thanks. Well I have not had a chance to BIF because all the birds froze and dropped. Maybe this weekend. For whatever reason my 1.4 III needs a lot of MFA with that lens. +13. I have canon rebel T3i. It was working properlly when i bought. But suddenly its picture quality started degrading. Pictures looked good in camera but when opened in computer, they were blurry with no sharpness. I tried all modes, auto and mannual focus, but all had same problem. I recently baught t In particular, check the following setting, which has a default setting of "0". These settilngs change the behavior of the shutter button so that it no longer engages auto focus when pressed, and moves the auto focus engagement to the AE Lock button. Try pressing this button before you make changes. Select the option near that bottom that is called Custom Controls. The first item in the list of controls is always the shutter button. Press the Set button on the camera to open the options for the shutter button. Change the setting from the default setting of Metering and AF Start to just Metering Start. Here’s how to enable back button focus on a Canon 5D Mark II and a Canon 50D (the settings are identical): Press the “Menu” button. Scroll over to the orange camera icon. Use the scroll wheel and choose C.FnIV:Operation/Others. Hit the “set” button (center button) to open the options. The first option you’ll see is “Shutter button 1) The autofocus works (As in the lens starts working) fine when in Liveview or in Video mode. 2) The lens is 100% set to AF and not MF. 3) When in live view and video mode both the half pressed shutter and the AF-ON button both work. Just NOT in normal mode (looking through the viewfinder and half pressing the shutter) .

canon 5d mark ii autofocus not working