5DIV & 70-200 f2.8 intermittent focusing problems

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MaxCh Senior Member • Posts: 1,299
5DIV & 70-200 f2.8 intermittent focusing problems

I am getting few out-of-focus shots with 5d4/70-200 f 2.8 II while shooting fencing practice. Most of the images are actually in-focus, but about 20%-30% are misfires and I don't see any reasons why these images would be OOF.

I assume the camera and the lens are fine since most pictures are OK. It's got to be my technique. What am I doing wrong? I would appreciate any ideas/suggestions.

I used the following settings: shutter speed:1/640,ISO:2500, f-stop:f/2.8, mode: AIservo, AF mode: Left Large Zone AF case 1.

Please note that I was focusing on the left fencer only . I was not concerned at all about getting the other fencer in focus but I did try to capture both fencers. This is why I used the left large zone AF instead of the center focus mode. I expected that AF would be able to track the fencer on the left, however as you can see from the images below, the AF system still missed some shots. I probably could use a center focus point somewhere on the left but I felt the it would be easier to track the fencer with a large zone AF. Their lunges are surprisingly fast and unpredictable.

Here is the first sequence. The images 1.1-1.3 are OK but the camera focuses on the wall in images 1.4-1.7.

1.1

1.2

1.3

1.4

1.5

1.6

1.7

The same thing happens in the 2nd sequence: The camera is focused on the left fencer in the first four images but loses focus in images 2.5 and 2.6.

2.1

2.2

2.3

2.4

2.5

2.6

I am also posting the same images with AF points. It looks like the camera was always focused on the left fencer (as expected).

1.1

1.2

1.3

1.4

1.5

1.6

1.7

2nd sequence with AF points:

I can understand why 2.6 would be OOF - the focus point are indeed on the wall, however in the 2.5 AF points are on the hand.

2.1

2.2

2.3

2.4

2.5

2.6

Thanks a lot in advance! I am new to FF cameras and 70-200 f2.8 so any suggestions are appreciated.

 MaxCh's gear list:MaxCh's gear list
Canon EOS 7D Mark II Canon EOS 5D Mark IV Canon EF-S 15-85mm f/3.5-5.6 IS USM Canon EF 70-200mm f/2.8L IS II USM Canon EF 70-300mm f/4-5.6L IS USM +5 more
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