Please explain to me what a 3-D DOF ref is and how I obtain one. I would like to get your method to work. For the sloping ruler method, as well as using the + target and lampshade, I have printed the FoCal target. It's not that I do not know what 3D is, but I have never seen a LensAlign target, which I assume may be a low relief 3D, and I do not understand why a 3D target is necessary when a 2D target works for the do it yourself sloping ruler method etc.
The advantage of a LensAlign target is that the flat 2-D surface serving as the AF target is machined to be on the same focus plane position as the "0" on the ruler attached to the target, whereas home-grown solutions may not be able to guarantee this tolerance. The LensAlign target also has a sight reference built into it to assure alignment between the camera and the target.
You have lost a lot of your credibility with your nonsensical argument. You are underestimating the capability of some user to achieve precision (same or better than LensAlign). Even then, why is 0 important? Even if 2D target is aligned to 2; you could look around 2. Finally, how is 0 alignment relevant to AFMA by your method? If you need complex 3-D target you got one irrespective.....
Are you CEO of LensAlign resorting to drastic measures to boost sales?
From easy to use with any target, any distance in field about your method, the fine print is creeping in - You need to buy LensAlign target, just to test the method? If someone has to spend $$'s, FoCal already works well!!!!