Ben is microadjusting.

You would think that after doing nerdy stuff all day at work I would do something fun at home.

NOT.

I microadjusted the autofocus of my Canon EF 24-70mm f/2.8L and EF 85mm f/1.8 lenses.

This process basically uses the on board software of current Canon cameras to compensate for front or back focusing lenses.

Lucky for me both lenses were spot on with my 5D Mark II.

Here is the image I used to microadjust my lenses, it is displayed at 100% on my 27" iMac.