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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 20 May 2008 (Tuesday) 10:06
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400D: I wish I could turn off the bottom focal point

 
javaprog
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May 20, 2008 10:06 |  #1

I'm constantly front focusing because the bottom focal point locks, especially in action shots. There are many occasions when I wish I could selectively turn a focal point off. Can other body models do this?

Example: There was a sudden flurry of activity on the small island across the pond. I turned and got these shots:

IMG NOTICE: [NOT AN IMAGE URL, NOT RENDERED INLINE]
http://rhenry74.homeip​.net …MAGES-NOT-ALLOWED-2287c)-

IMG NOTICE: [NOT AN IMAGE URL, NOT RENDERED INLINE]
http://rhenry74.homeip​.net …MAGES-NOT-ALLOWED-2287c)-

IMG NOTICE: [NOT AN IMAGE URL, NOT RENDERED INLINE]
http://rhenry74.homeip​.net …MAGES-NOT-ALLOWED-2287c)-

I swear if I could turn off the bottom focal point it would solve 25% of my focus issues. :(

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X-Warrior
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May 20, 2008 10:12 |  #2

You can't selectively turn just one off. But you can select one point and turn off the rest. It's the button on the top-right (at the back of the camera).
I believe center focus is the most used one (it's the one I use most often anyway).


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lkb-28
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May 20, 2008 10:39 |  #3

X-Warrior wrote in post #5560605 (external link)
You can't selectively turn just one off. But you can select one point and turn off the rest. It's the button on the top-right (at the back of the camera).
I believe center focus is the most used one (it's the one I use most often anyway).

Seconded... It's the way to go...

Having ALL focus points selected, the camera will ALWAYS focus on the nearest object... which, in this case is the foreground water...

Cheers;

Lee


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gjl711
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May 20, 2008 13:13 |  #4

It would really help if you looked at the pics using the Canon supplied ZoomBrowser and turned on the focal points to display which points the camera used. I'm guessing that the bottom one did not even come into play and your camera is front focusing.


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javaprog
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May 20, 2008 15:18 |  #5

gjl711 wrote in post #5561674 (external link)
It would really help if you looked at the pics using the Canon supplied ZoomBrowser and turned on the focal points to display which points the camera used. I'm guessing that the bottom one did not even come into play and your camera is front focusing.

I'll try that


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Madweasel
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May 20, 2008 15:22 |  #6

On these web-sized examples the focussing looks ok.


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javaprog
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May 20, 2008 16:00 |  #7

Madweasel wrote in post #5562575 (external link)
On these web-sized examples the focussing looks ok.

The more I try to figure out what went wrong the more perplexed I get.

Here's a crop: 1/320 f5.6 200mm at about 90 feet

IMG NOTICE: [NOT AN IMAGE URL, NOT RENDERED INLINE]
http://rhenry74.homeip​.net …MAGES-NOT-ALLOWED-2287c)-

I'm going to look at the focal points in ZoomBrowser too.

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tonylong
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May 20, 2008 16:07 |  #8

It looks to me like the focus was toward the back of the duck rather than the head. In a scene like this you really need to use spot focusing. Because you have one subject to isolate, you can generally the center spot to focus (more accurate) and focus on the head. f/5.6 with a telephoto lens gives a relatively shallow depth of field, which means that your in focus/out of focus fields will be reversed (the rear of the duck would be more out of focus than the head) but the result will still be better than what you see here.


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Analog6
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May 20, 2008 16:15 as a reply to  @ tonylong's post |  #9

I always use the centre (spot) focus. Only way for action photography.


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apersson850
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May 20, 2008 16:20 as a reply to  @ Analog6's post |  #10

That depends upon what kind of action you are taking pictures of.
If you are trying to follow subjects, with Servo AF, and these subjects not all the time remain in the center of the image, then using all points and thereby utilizing the camera's ability to hand over focus to a side point may be a good idea.


Anders

  
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javaprog
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May 20, 2008 16:38 |  #11

I think it looks like the sharpest point is in front of the goose, in the reflection.

"Show Auto Focus Points" in ZoomBrowser is disabled, which is also troubling. I wasn't shooting in RAW, but the JPEG is straight from the camera. The AF point EXIF data should be there.

I agree with everyone that I should have been using the center point and/or AI Servo if I was expecting acation; but I was shooting landscape, and it happend so fast I just turned and started pulling the trigger. :)


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javaprog
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May 20, 2008 16:52 |  #12

1/400th f5.6 200mm

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Maybe it's just motion blur

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Madweasel
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May 20, 2008 16:53 |  #13

I believe, looking at the crop, that focus is fine and what we have here is camera shake. The reason that the area of water in front of the goose looks sharpest is that in this example the camera movement is largely horizontal, so the vertical patterns in the feathers looks bad and the horizontal patterns in the water don't look so bad.


Mark.

  
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Madweasel
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May 20, 2008 16:56 |  #14

I was talking about the first crop there, but you posted another while I was typing. In the second one again I think focus is accurate, but you are panning a moving target and everything is movement-blurred. If you look at the water drops behind the bird, they are very thin lines. This means they are focussed correctly but have moved during the exposure. In quick action like that, you should be up around 1/2000 or so.


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tonylong
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May 20, 2008 16:59 |  #15

javaprog wrote in post #5563065 (external link)
I think it looks like the sharpest point is in front of the goose, in the reflection.

You may be right about the focus being toward the front.

At any rate, using either the center point or an alternate point for AF gives you more control. However, you can still find your focus moving to an object with more contrast. You really have to stay glued to your viewfinder to try to pick up on those focus shifts.

"Show Auto Focus Points" in ZoomBrowser is disabled, which is also troubling. I wasn't shooting in RAW, but the JPEG is straight from the camera. The AF point EXIF data should be there.

I've never used ZoomBrowser. I seem to remember this type of problem being resolved somewhere in this forum -- maybe search for "Show Auto Focus Points" and see if you can find a reference.

I agree with everyone that I should have been using the center point and/or AI Servo if I was expecting acation; but I was shooting landscape, and it happend so fast I just turned and started pulling the trigger. :)

Heh! This happens to me all the time! I frequently carry two bodies, one set up for wide shots and one for telephoto shots, but even then a quick change from one shooting mode to another can be...interesting:)!


Tony
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Wildlife project pics here (external link), Biking Photog shoots here (external link), "Suburbia" project here (external link)! Mount St. Helens, Mount Hood pics here (external link)

  
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400D: I wish I could turn off the bottom focal point
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