I also purchased the Lens Align and did use it. There are 5 of them each stepped 1/2" behind the previous one. Many years ago I built my own rig, targets glued to foam core blocks. While doing af fine tunes, I will de-focus in one direction and get slightly different results if de-focusing in the opposite direction. Put another way, the AF systems won't put the focus on the exact same spot every time, there is a little "slop" and it also depends on which way the focus is turning to get there. More often than not, my lenses are close enough out of the box that they are within the variable ability of the AF system. Look at it on the lcd and if the sharpest part is where I focused, no adjustment needed. I find one post and focus on it, take the picture with the lens aperture wide open. When in the field I usually am able to find something that will serve as a test subject. Does the lens need calibration? There are simple tests you can do before spending time and money to calibrate.
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