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Canon 50mm 1.4 focus issues

Started Sep 24, 2013 | Discussions thread
billythek Veteran Member • Posts: 5,260
Re: Canon 50mm 1.4 focus issues

Ah! So you use AI servo.  The story becomes more interesting.

AI servo is not great on the 5D2, but can work OK with the center point, especially if you are not trying to track something moving extremely fast, and you have good light.

Back-button AF on the 5D2 is a little different than with the 5D3 that I'm using now, and I forget all the nuances of the menu settings on the 5D2.  The video I pointed you to by Rudy Winston was done back in those days, though, so he should be able to cover the settings.

Anyway, you need to lock focus somehow if you recompose while using AI servo, otherwise the camera will just continue to focus using the AF point where you move it to. So maybe you can go into some details about how you go about doing that, since there are several possible ways.

Also, maybe you can give details on how you select the center point for focusing, and if you use AF point auto expansion.

Any other relevant AF menu settings would be good to know, as well.  What are CF III-3, CF III-7, CF IV-1, CF IV-2 set to?  Do you have CF III-8 set to something other than disable?

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- Bill

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DxO One Canon EOS 5D Mark III Canon EF 70-200mm F2.8L IS II USM Canon EF 24-70mm F2.8L II USM
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