Then turn the focus ring and see if the AF Motor is working. This ONLY WORKS in One Shot AF. The electronic focus ring DOES NOT WORK in Servo AF. Manual Focus on Focus By Wire lenses require the AF Motor to move lens elements. Make sure Option 2 is set. Or the lens' electronic focus ring WILL NOT WORK with the lens set to AF Mode. Make a back up of your settings to an SD Card. Now perform a reset. Both main and custom settings. Retest AF function. These types of issues are often caused by an incorrect setting, unless you are using 3rd party glass or adapter. 03-26-2021 02:13 AM. Lately my 1DX MKIII autofocus has had an intermittent failure issue. I generally use the large zone, AI auto focus setup, and sometimes it just stops working. The small auto focus square disappears and i can't focus at all. I can't change autofocus zones and use a diffferent method, the whole thing just locks up.
Q13 - The shutter count is not displayed for new cameras (5D IV, 5DS/R, 1D X II, etc.) Update to ShutterCount 3.0 or later on your Mac or iOS device. The Windows version will support these cameras later on. Dire Studio also now offers an add-on Live View Pack to their Shutter Count app that allows one to see Live View stills and Live View movie

Canon DSLR bodies prevent poor auto-focus performance by disabling it completely when the lens reports maximum aperture at chosen focal length smaller than f/5.6. This implies that some lenses will not auto-focus on a teleconverter, e.g. the popular Canon EF 100-400 f/4.5-5.6L, or any f/4 lens on a TC stronger than 1.4×.

How to fix the flipping problem in Canon G7X Mark II in Point & Shoot Digital Cameras 12-26-2023; My EOS M50 Mark II will not work with EOS Webcam Utility. in EOS DSLR & Mirrorless Cameras 12-26-2023; EF 70-200 2.8 L IS II USM focus not working in EF & RF Lenses 12-22-2023 fVKy.
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    • canon 5d mark ii autofocus not working