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Thread started 05 May 2010 (Wednesday) 06:46
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7D focus point movement weirdness

 
kb9tdj
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May 05, 2010 06:46 |  #1

I had some strange autofocus point activity last evening while shooting a softball game. I have C.Fn III-12 (Orientation Linked AF Point) set to 1 so that I can automatically switch focus points when switching the camera from landscape to portrait orientation when shooting.

I was shooting in landscape orientation and had the second-from-top-center focusing point chosen (I am using a single focus point with AF point expansion enabled and AI servo with * button focusing). When I switched the camera to portrait orientation, the focus point shifted, but it shifted to one of the bottom-left points (don't recall exactly which one) when I had previously set the second-from-top-center point for that orientation. I had several other instances of seemingly random focus point movement when changing orientations as well. I'm not quite ready to blame the camera as since I am using the * button to focus I could have inadvertently hit the AF point selection button. However, I don't believe this to be the case since I would have to then rotate either the main dial or quick dial and I did not do that.

I do know that when changing the camera orientation sometimes the focus point will not shift until I hit the focus button (*). I also have had some instances where it seemed the internal sensor did not detect the orientation change of the camera and I had to rotate it once or twice in order for it to detect the change in orientation and then move the focus point accordingly.

Has anyone else experienced this issue?


Scott
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bsmotril
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May 05, 2010 07:42 |  #2

When you selected the focus point for the other mode, did you "register" it as the point for that mode? If you just select it, the next time you transition from portrait to landscape, the point is going to revert back to the registered point versus the one you selected for the last shot in that orientation.


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kb9tdj
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May 05, 2010 08:54 |  #3

bsmotril wrote in post #10125010 (external link)
When you selected the focus point for the other mode, did you "register" it as the point for that mode? If you just select it, the next time you transition from portrait to landscape, the point is going to revert back to the registered point versus the one you selected for the last shot in that orientation.

Yes, I "registered" it according to the procedure in the manual. I placed the camera in landscape mode and selected the focus point I wanted. I then switched to portrait orientation and then selected the focus point for it. Most of the time the focus points switched as expected when changing orientations; it was just some of the time where I experienced the unexpected focus point movement.

It's a real pain because I shoot sports action and sometimes when the problem occurred the focus point was way in a corner which made it impossible to focus on my moving subject and have the framing I desired (i.e. base runner running towards me and having to use the extreme bottom left focusing point).


Scott
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bsmotril
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May 05, 2010 12:15 |  #4

I've noticed some weirdness on mine when I transition the camera orientation with the lens pointing downwards versus horizontal to the ground. Same thing happens sometimes when shooting skywards. I think when the lens is off the horizontal axis, the G sensors get confused.


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apersson850
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May 05, 2010 13:07 |  #5

bsmotril wrote in post #10125010 (external link)
When you selected the focus point for the other mode, did you "register" it as the point for that mode? If you just select it, the next time you transition from portrait to landscape, the point is going to revert back to the registered point versus the one you selected for the last shot in that orientation.

This is not true. It doesn't take anything more than that you move the active point to, say, the topmost one in horizontal orientation, turn the camera to verticals, move the point wherever you like, then turn the camera back to horizontal again. Now you once again has the topmost point active, since that's how you left if before you flipped the camera over.

Registering a Home Point (HP) is something else. It can also be done for the different orientations, but it is something else.


Anders

  
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7D focus point movement weirdness
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