Focus question: 1DsM2, 20D &10D.

I posted this on DPReview, but then I'm not 100% satisfied with the replies..
I tested my 1DsM2 for backfocus using 4 lenses: the 50mmf1.4, 17-40, 100f2.8 and 28-135. For the test I used this chart, at the bottom of the page.
All three cameras focus perfectly, when I'm close to the chart. Not when I'm far.
I noticed this also when shooting other objects, that I get backfocus when shooting a distant object. I always make sure I have enough contrast/lighting.
Could this happen? How could all 3 cameras perform similarly? If it's something wrong that I'm doing, then what is it?

We would need to see some samples to comment. There are too many variables without seeing what you are doing. It is VERY easy to confuse the camera with these tests. Also be aware that AF is NOT an exact science and all camera makers state this as so. Just because you select AF does not mean every photo will be in focus.

While RFM has given a very professional answer, and one that I completely agree with, let me give you my spin on it. I visited the website you linked. It's to a Noink website for the D70. THAT explains it in a nutshell.

MDJAK wrote:
It's to a Noink website for the D70. THAT explains it in a nutshell.

I'm sorry, I don't understand..What does Nikon have to do with a test chart?

Yeah like Jim says, post some examples for us to take a look at.

The link you posted was from a Nikon enthusiast's website. I was only joking. Thus, the smiley face.

I could reeeaaaally be slow sometimes!
I'll post pics probably tomorrow.

Sorry this took longer than expected, as I found out I deleted the files, so I took new shots today.

Here is where I focused: (50% crop)

http://www.artmaker.us​/test1.jpg

And here's the full image:

http://www.artmaker.us​/test2 (Large).jpg

BUT, when I focus on an object close to the lens, then I have no problems, as in the following image. How could this be possible? Could backfocus occur depending on the distance to subject?

No problems in this one

AND, I apologize for the size of the images, although I think it's better this way.

You need to limit photo sizes to 800 pixels on any one side, or (instead) post a link as edited above.

Done. Thank you.

I just read on Canon's site that the issues are the lens and not the bodies. this might explain why your results were the same regardless of the body you used.

That info is in here-
http://www.photoworksh​op.com/canon/EOS_Digit​al.pdf

The link to your full image isn't working and the quality of your smaller pic isn't very clear. However, looking at the selected AF point it appears to be partly covering two boxes which wouldn't be a problem as long as both boxes were at exactly the same distance from the camera. It does appear though that the right hand corner of the upper box may be slightly closer to the camera?

More significantly, there appears to be a piece of card or paper sandwiched between the two boxes which is also within the selected AF area which is protruding out quite some distance, and is closer to the lens than both boxes. If this is so then look no further for the cause of your focusing problem as no AF system can focus on two, possibly three planes at once.

Fixed. Here it is again anyway.

The boxes are almost at the same distance from the camera, which, and I am just guessing is about 25 feet.
However, look in the direction of the refrigerator. Does it appear sharper?