Star tests are generally done with a 2.3mm eyepiece and s test tunnel with an artificial star.
As I've said before, if you are looking for a optics that meets you strict needs and has documention to boot there are plenty of companies that will supply you with that.
Strehl numbers are great for internal use to keep track of quality. Releasing number does nothing but cause problems. Number get released and one guys optics are slightly dofferrnt than another and it becomes a 50 page discussion with no end. So Sky-Watcher will not release numbers for the same reason many another manufacturers do not.
If you are curious about these scopes we welcome you to attend TSP or any of major upcoming events where we will be demoing these scopes. Come by and use them. As I've said wth our high end triplet Apo refractor (which also got the same level of scrutiny, and surpassed it) I let our products speak for themselves.
Edited by skyward_eyes, 22 January 2017 - 11:52 AM.