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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 19 Aug 2014 (Tuesday) 01:31
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5d mark iii outer focus point problem

 
Thestructured
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Aug 19, 2014 01:31 |  #1

I've been noticing that my 5d3's outer AF points are producing a ton of out of focus photos.

I'm referring to any outer focus point aside from the center cluster, however, I almost always have it set to cross type points only, so assume that I'm talking about the outer cross type focus points. Also assume that I use single point or spot AF selection (well, unless I'm tracking a moving subject, then I use expanded or zone AF). And unless something is moving, yes, I'm in one shot. Sorry, but I'd like to avoid the annoying 'user error' comments.

It's been particularly frustrating because I have purchased FIVE sigma 50mm 1.4 art lenses and returned them for having focusing problems, which may actually be due to the 5d mark iii, at least in part, though they acted funny on my 6d as well.

What's happening is with fast primes, the center focus points work fine, but using any outer focus point (cross type) results in front focusing. I tried my friend's 5d3 and hers was doing exactly the same thing but slightly worse. This is particularly frustrating because using AFMA to correct for the front focusing of the outer points throws off the center points.

Anybody else experience this? I had this EXACT same problem when I had a 7d a few years ago and even after two trips to canon service it was still doing it, though to a lesser degree.


2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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Thestructured
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Aug 19, 2014 01:35 |  #2

These zoomed in examples are with the canon 85 1.2L ii. It's even worse with the sigma 50 art, and less noticeable with the sigma 35 art due to it's wider dof. Center point = fine

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Outer point = front focus
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2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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apersson850
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Aug 19, 2014 09:08 as a reply to  @ Thestructured's post |  #3

What happens if you use any of the four high accuracy points that are not in the center? Do you get the same fault?

Just trying to find out if that's the problem, or if it's something else.


Anders

  
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Invertalon
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Aug 19, 2014 11:08 |  #4

I had that problem with a 35L and thought it was due to field curvature and somehow it messing with the AF system. But when I got a new 35L months later it worked perfectly. May have been a tilted element or something in the lens.

Canon once adjusted my AF assembly saying it was "out of position". Perhaps it is skewed and not square and needs adjustment. It may be worthwhile to send to Canon for repair, if you can.


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snake0ape
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Aug 19, 2014 12:30 as a reply to  @ Invertalon's post |  #5

The 5diii has a reputation of having accurate off-center focusing. It's one of the main reason one would upgrade from a mark II to a iii. If I were you, I would sent it in to canon and precisely tell them which focus points are bad. Send in photos too.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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Mathmans
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Aug 21, 2014 07:07 |  #6

Are the outer focus points "out" only with Sigma lenses or also on your Canon 85mm 1.2L ii?


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cdang
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Sep 03, 2014 12:52 |  #7

Some people have been experiencing this problem with the 5D3 (myself included). The five centre points have a more accurate depth of focus, therefore with super fast lenses, it is super accurate. But use any of the outer cross type points, and it is hit and miss. It is a frustrating journey sending back and forth to canon explaining the problem with each response coming back as 'within in canons specs'. I wonder if anyone has this problem on the 1DX ?




  
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windpig
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Sep 03, 2014 15:16 |  #8

don't use the very out points on the wide side, using the ones that are just inside of the very outer work much, much better.


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snake0ape
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Sep 03, 2014 19:35 |  #9

Below is an article that explains the 5Diii's numerous types of AF focus points.
I am quite happy with both the dual and single cross type points. I don't have any issues with them.

http://www.kentyuphoto​graphy.com …i-new-features-explained/ (external link)


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
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TeamSpeed
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Sep 04, 2014 05:54 |  #10

I use outer points all the time while shooting sports, I haven't had any issues with my copy.


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tagnal
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Sep 04, 2014 20:18 |  #11

I use all outer points all the time as well. Cross and even non cross type. I don't have any issues with them nailing focus.


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cdang
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Sep 08, 2014 04:38 |  #12

The only real problem is with very fast lenses. 85L and 50L for me. My other lenses are fine




  
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bobbyz
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Sep 08, 2014 07:55 |  #13

cdang wrote in post #17141684 (external link)
The only real problem is with very fast lenses. 85L and 50L for me. My other lenses are fine

Don't have 50L but 85L works quite nice on my 5dmk3 using outer cross type points. So do any of my other f1.4 glass.


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Thestructured
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Oct 23, 2014 04:33 as a reply to  @ bobbyz's post |  #14

This is with only cross type points enabled so the 'single orientation points being less accurate/consistent' thing is ruled out. Ironically my 6d, with only single orientation outer points focuses accurately. I understand that the center points being dual diagonal are going to be the most accurate, but that does not mean other points are not accurate, more so just that they will be less reliable in demanding situations. This isn't even an inconsistency...it's a consistent result. The outer points are actually very consistent..in focusing just in front of the subject.

The camera has made three trips to canon and they have told me it's 'in spec'. Is this a cruel joke? If it was user error why do I not have problems with my other camera(s).

And originally I thought it was just the sigma, but it turns out it's doing this with all of my lenses. Canon originally tired to blame the lens, so this time I sent it in with examples/tests using three different lenses that all focus perfectly on my 6d, and perfectly with the 5diii's center point.


I'm getting the camera back today at some point and hopefully something was done. If not, I'm going to go to the store and start assembling my nikon rig. I've had this exact problem with a 7d I owned in the past, and one of my friends has the exact same problem with her 7d. We must have very bad luck. I tried a nikon D750 the other day at a local store and it was a nerve-wrecking experience. It was so good- it just worked. The autofocus was spot on every time, the high iso was incredible, tilt screen, other nikon features, the sensor overall..AWB..

IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-08-19%2001.40.15.png
IMAGE: https://dl.dropboxusercontent.com/u/6485893/Screenshot%202014-08-19%2001.40.34.png

2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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Thestructured
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Oct 23, 2014 04:38 |  #15

IMAGE: https://dl.dropboxusercontent.com/u/6485893/85L%20f2.0%20focused%20with%20center%20point%2C%20then%20recomposed%20so%20target%20is%20over%20far%20right%20cross%20point.%20%28sharper%20than%20using%20the%20outer%20point%29.png
IMAGE: https://dl.dropboxusercontent.com/u/6485893/85L%20f2.0%20right%20cross%20focus%20point%2C%20directly%20over%20target%20%28soft%29.png

2x Nikon D750// nikkor 24-70 2.8g // sigma 35mm 1.4 art// sigma 50mm 1.4 art// nikkor 85mm 1.4g// Nikkor 70-200 2.8 vr ii // 4x SB700// WL x3200 + x1600 http://www.marekkphoto​graphy.com (external link)

  
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5d mark iii outer focus point problem
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