« on: December 19, 2012, 09:54:11 PM »
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Guys remember designing a work around isn't the way forward, There shouldn't be a need to have to work around a problem that basically should not exist in the first place, Im worried that the problem may start to become overshadowed by "what we all can do instead" I really am hoping for this tread to get heard, its a real problem and I do not believe for a moment it only happens in certain cameras (ie other 5D3's don't have this problem) its a problem with the 5D3 itself and needs to be addressed,
I would like to say thanks to everyone that has of course offered help in ideas making it easier while we wait for answers, but let us not forget the true problem exists and needs to be fixed,
I too have seen this issue but get around it 99% of the time by using servo focus. With moving subjects at wedding receptions, this is often the better approach anyway. You certainly have to move the autofocus point around and can't recompose once locked. This seems to work better with my sigma 50mm 1.4 than it does with the 70-200 presumably because of the extra light at max aperture.
My personal opinion is that using servo in this fashion is still much better than the hit or miss focus of my 50d even with the assist light. It was like rolling the dice with the 50d when focusing with the 50 1.4.
In summary...this issue is painful, but not a showstopper for wedding photography.
I am a wedding photographer and have shot 25 weddings and receptions this year with the 5D3 and 600ex. I started a thread about this issue about a month ago and I finally sent my camera in to Canon to get the shutter replaced and the light leak issue resolved and I specifically complained about it the AF assist beam. When they sent it back they mentioned they made some "electrical adjustments" to the shutter and AF. They never acknowledged there was a problem or said that they did anything to fix it. I haven't shot a wedding since then so I haven't gotten a chance to really test it out yet but I did some quick tests and sometimes there appears to be some improvement. Other times it still seems slow. I don't think there is a way to know until I shoot a wedding again. I do think it is interesting they didn't even acknowledge there was a problem and always say it is the first they have heard of the issue.
Canon technical support told me that the AF assist beam is not supported with this combination (5D3 and 600ex)