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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 14 Jan 2014 (Tuesday) 07:48
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70D focus issue & blurred pictures

 
single_track
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Mar 16, 2014 15:27 as a reply to  @ post 16762898 |  #166

^ I say get it. I think the problem is quite limited. Personally, I would get it from a dealer that will take returns, on the outside chance that you end up with a problem. It is easy to test and confirm.

Unless you are in Germany, then maybe wait.


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hairy_moth
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Mar 16, 2014 17:02 |  #167

kezug wrote in post #16762898 (external link)
Has anyone determined how wide spread this issue is? and how real this issue is?
... I am very near a decision on whether or not to invest in this camera. Ugh.

At this point, I believe the problem is real. However, with the possible exception of Germany, there is nothing in this thread to suggest how widespread the problem is. I suspect the percentage of affected cameras is low (but I don't really know).

If it was me, I would get it (from a reputable dealer as another has suggested). I would, however, do an immediate test, with my fastest lens, similar to the one done in the English YouTube video.

The only caveat to that would be: if I didn't currently have an f/2.8 or faster lens, but planned on buying one in the near future, I wouldn't buy this camera right now because (without that lens) I wouldn't be able to test the body for the problem... so I'd wait until I could get the camera and lens together.


7D | 300D | G1X | Tokina 11-16mm f/2.8 | EF-S 17-55mm f/2.8 | EF-S 60mm f/2.8 Macro | EF 85mm f/1.8 | 70-200 f/2.8L MkII -- flickr (external link)

  
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Scoobert
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Mar 16, 2014 17:38 as a reply to  @ hairy_moth's post |  #168

I have one of these bad copy's and found out after I was outside the 30 day return window from B&H.
But I would still buy another today. As long as I had a way to test it and a dealer ready to let me exchange it.
I agree that I don't think the problem is in the majority of the camera's. But the numbers of us are going up as more people test.
So most people wont think its a big deal. Unless you are one of the ones stuck with borked 1000 dollar camera.




  
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kezug
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Mar 16, 2014 19:52 |  #169

hairy_moth wrote in post #16763140 (external link)
At this point, I believe the problem is real. However, with the possible exception of Germany, there is nothing in this thread to suggest how widespread the problem is. I suspect the percentage of affected cameras is low (but I don't really know).

If it was me, I would get it (from a reputable dealer as another has suggested). I would, however, do an immediate test, with my fastest lens, similar to the one done in the English YouTube video.

The only caveat to that would be: if I didn't currently have an f/2.8 or faster lens, but planned on buying one in the near future, I wouldn't buy this camera right now because (without that lens) I wouldn't be able to test the body for the problem... so I'd wait until I could get the camera and lens together.

So this issue, when it presents itself, is only on certain Aperture and Focal distance?


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hairy_moth
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Mar 16, 2014 20:00 |  #170

Scoobert wrote in post #16740997 (external link)
Be happy you got a good copy MANY people are having this same issue. As to the light (indoor/outdoor) it shouldn't matter. As long as there is plenty of light for it to get a lock.

Here is several test with several different lenses. All displayed issues at range.

http://www.youtube.com​/watch?v=cA6JnzYSDJE (external link)

kezug wrote in post #16763512 (external link)
So this issue, when it presents itself, is only on certain Aperture and Focal distance?

The issue is pretty well described in the youtube link Scoobert presented, so is a good testing procedure. He sized up the issue pretty thoroughly, you will not need to do all of the tests he did to determine whether or not your body has the issue, but his test procedure is a good place to start your own tests.


7D | 300D | G1X | Tokina 11-16mm f/2.8 | EF-S 17-55mm f/2.8 | EF-S 60mm f/2.8 Macro | EF 85mm f/1.8 | 70-200 f/2.8L MkII -- flickr (external link)

  
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Scoobert
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Mar 16, 2014 20:26 |  #171

kezug wrote in post #16763512 (external link)
So this issue, when it presents itself, is only on certain Aperture and Focal distance?

From what can tell FL does not matter. Its all about the aperture.

The 70D came out with a (CORRECTED) Double Cross point focus on the center point. Anytime the 70D hits 2.8 aperture this double cross engages. Outside of 2.8 its just a regular cross focus point.

IMO..and this is just a guess

I think this thing is borked on some 70D's. Because outside of 2.8 this thing nails focus constantly through the viewfinder. Inside of of 2.8 when this magical double cross engages this thing as all but worthless.




  
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TeamSpeed
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Mar 16, 2014 20:43 |  #172

Scoobert wrote in post #16763584 (external link)
From what can tell FL does not matter. Its all about the aperture.

The 70D came out with a new and first time used Double Cross point focus on the center point. Anytime the 70D hits 2.8 aperture this double cross engages. Outside of 2.8 its just a regular cross focus point.

IMO..and this is just a guess

I think this thing is borked on some 70D's. Because outside of 2.8 this thing nails focus constantly through the viewfinder. Inside of of 2.8 when this magical double cross engages this thing as all but worthless.

5d3 has more than 1 such AF sensor and is older than the 70d.


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Keyan
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Mar 16, 2014 20:53 |  #173

60D is dual cross. 7D is dual cross, it is the same phase detection array as the 70D uses, I have no idea where that idea is coming from.


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Scoobert
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Mar 16, 2014 21:03 |  #174

TeamSpeed wrote in post #16763624 (external link)
5d3 has more than 1 such AF sensor and is older than the 70d.

Keyan wrote in post #16763636 (external link)
60D is dual cross. 7D is dual cross, it is the same phase detection array as the 70D uses, I have no idea where that idea is coming from.


Correct....need to learn to check more then one source

Now if you guys could just explain to canon on how to make the 70D's work like the other ones, that would be great.




  
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gabebalazs
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Mar 16, 2014 21:45 |  #175

I personally do support the extra sensitive center point problem theory. While I do believe that only a small number of 70D's are affected, the issues described pretty much exactly mirror my experience with my first 7D (an early series copy). I think I may have even talked about it here on POTN years ago.

Obviously a lot of other Canon bodies have the extra sensitive dual cross type sensor at the center, I've had probably 8 different ones through the years. But only my first 7D had this problem and only with the center point and certain fast lenses (2.8 or faster). No problem with outer points with any lens, or center point with an f/4 or slower lens. I even made a note to Canon about the extra sensitive center point issue theory when I sent in my 7D a couple times to Canon, along with my 17-55 2.8 IS, which unfortunately was one of the lenses affected. That lens worked well with my other bodies by the way.

So seeing that some 70Ds seem to show similar problems is unfortunate but not entirely surprising to me.


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Keyan
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Mar 16, 2014 21:50 |  #176

So did Canon ever correct it on your 7D?


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nazmo
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Mar 17, 2014 07:20 |  #177

Hi All, just to give my input.

Canon 50mm 1.4 - Front focused, I fixed this with a +13 micro adjustment

Tamron 17-55mm f2.8 - Focusing at all apertures seem OK under 3 meters. Over 3 meters, I need to change stop to f4.

Tamron 70-200mm f2.8 non-vc - Was front focussing, +3 adjustment.
HOWEVER, at 2.8, any distance within 3 meters, no issue at 2.8. Any distance over 3meters, I need to stop to f4 or f4.5 to ensure sharpness. No micro adjustments help here.

So it seems large aperture at distance can be problematic. I must still do a more scientific approach, but this seems to be happening to me.


70D :: Sigma 50mm 1.4 A :: Tamron 17-50mm 2.8 :: Simga 18-35mm 1.8 A :: Sigma 50-150mm F2.8
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TeamSpeed
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Mar 17, 2014 07:27 |  #178

nazmo wrote in post #16764241 (external link)
Hi All, just to give my input.

Canon 50mm 1.4 - Front focused, I fixed this with a +13 micro adjustment

Tamron 17-55mm f2.8 - Focusing at all apertures seem OK under 3 meters. Over 3 meters, I need to change stop to f4.

Tamron 70-200mm f2.8 non-vc - Was front focussing, +3 adjustment.
HOWEVER, at 2.8, any distance within 3 meters, no issue at 2.8. Any distance over 3meters, I need to stop to f4 or f4.5 to ensure sharpness. No micro adjustments help here.

So it seems large aperture at distance can be problematic. I must still do a more scientific approach, but this seems to be happening to me.

That is a common issue, and not one related to the 70D. There have been many, many times in the past where MFA (for bodies that have it) can fix a lens for some set distance, but at other distances, the MFA has to be a different value. This is why Sigma came out with their new lenses where you can adjust AF in stages.


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MakisM1
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Mar 17, 2014 07:35 |  #179

May I suggest that ANYONE who tests their 70D post their results whether positive for this problem or not and a portion of the serial number of their camera (somebody has to do the research, so that privacy is ensured, while meaningful results can still be obtained)...


Gerry
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Mar 17, 2014 07:45 |  #180

MakisM1 wrote in post #16764257 (external link)
May I suggest that ANYONE who tests their 70D post their results whether positive for this problem or not and a portion of the serial number of their camera (somebody has to do the research, so that privacy is ensured, while meaningful results can still be obtained)...

Good idea!


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70D focus issue & blurred pictures
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