Calibrate your lens : Lencal availalble at Photoclear

for owner of advanced DSLR like
* Canon (50D, 7D, 5DMkII, 1DMkIII, 1DMkIV, 1DsMkIII, 1DIV)
* Nikon (D300, D300s, D700, D3, D3s, D3x)
* Sony (A850, A900)
* Olympus (E-30, E-620)
* Pentax (K20D, K7D)

that Supports autofocus adjustments:

we have acquired a lenscal that allow to precisely adjust the AF for each of your lens

Many newer models of popular DSLR cameras have a lens micro calibration feature which requires a reference test system to adjust the autofocus. SpyderLensCal was designed to aid in correcting the autofocus by enabling photographers to store them in custom camera settings on recent DLSR bodies. With the capability to store lens autofocus corrections on recent DSLR cameras, users can easily change from lens to lens without needing to recalibrate.

“Autofocus inaccuracy can exist on even the most high-end lenses, and can negate an entire day’s worth of shooting or other assignments if left unaddressed,” said Christoph Gamper, Vice President, Consumer Business Unit. “Professional photographers today are using a variety of lenses, differing in focus depending on the combination being used with the camera body. The SpyderLensCal gives photographers a tool that allows them to correct discrepancies on their own while improving the quality of their work by increasing the number of usable shots.”

SpyderLensCal’s lightweight and compact design comes with a built-in level and is tri-pod mountable for optimum consistency. Molded in durable, rigid resin, SpyderLensCal is the ultimate hard-wearing and long-lasting accessory, able to handle even the most extreme conditions.


look here for more explanation

I'm not surprise that you have already acquired this calibrator....
It seems very simple and efficient to use... when you have the right body!

It works also with the Nikon D7000...

"L'autofocus mérite-t-il notre confiance ?
Les déboires récents rencontrés par les utilisateurs de boîtiers professionnels
prouvent que les meilleurs appareils ne sont pas à l'abri d'un décalage du point.
C'est pour remédier à ce problème que Datacolor sort un nouvel outil d'étalonnage
des appareils et des objectifs, le SpyderLensCal."

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