Help! Canon 5D Mark iii - Autofocus issue - Works in LV but NOT via viewfinder

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SunBlack Regular Member • Posts: 412
Help! Canon 5D Mark iii - Autofocus issue - Works in LV but NOT via viewfinder

Hello fellow Canon users,

I need your help! I haven't used my Canon 5D mark iii in around a month (Everything was working fine). Today, I turned the camera on to take some photos and to my surprise the autofocus doesn’t work. Below are the symptoms and also the things I’ve tried. I wondered if anyone out there may be able to help me.

1) The autofocus works (ss in the lens starts working) fine when in Liveview
2) The lens is 100% set to AF and not MF.
3) When in live view and half pressed shutter autofocusa works
4) I've check the custom button menu (C.Fn2) both the AF-ON and Shutter button are set to Metering and AF start.
5) I cleaned electric contacts in the camera
6) I've tried 3 of my lenses with the same result.
7) When I look through the viewfinder I cant see focus confirmation light
8) I've tried all shooting modes A+, P, Tv, Av, M, B, C1, C2 etc

9) on top LCD is written M Focus

I'm completely lost and your need help. I've got everything crossed hoping someone out there might be able to solve this mystery.

Thanks in advance guys!

 SunBlack's gear list:SunBlack's gear list
Canon EOS 5D Mark III Canon EOS 6D Canon EF 300mm f/4.0L IS USM Canon EF 70-200mm F2.8L IS II USM Tamron 15-30mm F2.8
Canon EOS 5D Mark III
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