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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Jan 2007 (Monday) 17:01
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Auto Focus "Vibration"

 
Detrimental
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Jan 29, 2007 17:01 |  #1

Please excuse me if this is not the correct place for this. Today while at the beach when I tried to autofocus on this building the lens started vibrating very quickly, I guess shifting very rapidly between to different focus settings. It did this when the focal point was over the rails. I found this very odd as it has never done something like that before. Is it safe to assume it was just the slight camera shake combined with the autofocus system switching back and forth betweent he rail and the area behind it?

It would not even have made me wonder had it not been for the very fast and intense shaking or vibration that occured when this focus ihit this point. It would not settle on either focus point and would shift as long as I was holding the focus button while aimed at the railing. I thought my IS had just started to malfunction until I moved the focus away from the rails and it locked perfectly.

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What do you think?

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Mark_Cohran
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Jan 29, 2007 17:05 |  #2

Sounds odd to me. Was it repeatable? I mean it sounds like rapid focus hunting, but there should have been enough contrast in the rails to allow it to lock on. Did you try it on anything else with a vertical pattern like that?

Mark


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Detrimental
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Jan 29, 2007 17:08 |  #3

It was repeatable on that particular building and rails at the time, I did it like 3 times each break to focus on a part besides the rail to see if it would lock focus (which it did). I did not do any more testing than the few moments wondering what was going on and getting the focus to lock a few times and seeing how the rails caused issues..


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Tee ­ Why
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Jan 29, 2007 17:10 |  #4

all those lines may have confused the AF system.


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Mark_Cohran
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Jan 29, 2007 17:12 |  #5

Detrimental wrote in post #2621652 (external link)
It was repeatable on that particular building and rails at the time, I did it like 3 times each break to focus on a part besides the rail to see if it would lock focus (which it did). I did not do any more testing than the few moments wondering what was going on and getting the focus to lock a few times and seeing how the rails caused issues..

Were you using a single focus point, or were all focus points enabled? If the latter, I suspect the camera couldn't decide which focus point plane to use.

Mark


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Detrimental
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Jan 29, 2007 17:26 |  #6

I may actually have been in AF Servo from previous shots which makes more sense as to why the camera would have such a hard time picking one focus point and could get confused. I am actually pretty certain that was the problem now. Still it was a really weird activity that surprised me.


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Mark_Cohran
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Jan 29, 2007 17:40 |  #7

Detrimental wrote in post #2621738 (external link)
I may actually have been in AF Servo from previous shots which makes more sense as to why the camera would have such a hard time picking one focus point and could get confused. I am actually pretty certain that was the problem now. Still it was a really weird activity that surprised me.

That would make a lot of sense.

Mark


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Auto Focus "Vibration"
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