Nice try, but if look closely you will see your example is really just a pairing of the exact same image, not a real inside and outside focus shot.
I have looked at every star test image I could find on the internet, but have never found "identical" in and out of focus images. The best test was of a 100mm Zeiss, but even there slight differences in the intensity and sharpness of the images were present.
Go to the Aberrator web site and try to find even one telescope with test identical images. You can't. Even the best telescopes show slight differences.
Even if your 90mm achro had the best lens ever made, the inner and outer images could not be identical due to chromatic aberration, which causes the outer diffraction rings to be different colors. If you cannot see the color differences, you may want to be tested for color blindness.
Maybe we just have different understandings of what the word "identical" means. To me it is pretty much absolute, where your definition apparently allows for minor color and sharpness differences.
Still, you did a nice job on the telescope and I am sure it puts up some great views.
That's not my personal example; just something I found online. Your guess is as good as mine as to its authenticity.
I was referring to the pattern only in that, nothing else; the rings, as they did appear the same on both sides of focus. I guess you'd have to be here, eh? Now, I don't expect this doublet to be perfect, given its mass-production, importation and second-hand pricing, so don't take it too seriously. Star-testing is not accomplished in one sitting, as I will be testing it multiple times before me, myself and I are satisfied.