I have an Antares 102mm, f6.2 refrac. and had an 80mm, f6 as well ! Both put up great views on those great nights but they weren’t professed to be semi anything just excellent quality achros and they were ! This 127mm if you read the old literature from back in 2005-2007, from the Canadian Company that built / put together these scopes they reference semi ed or apo or both for the 2 127mm and 1 154mm models ! As well the chinese company that you reference built scopes for various scope companies is probably correct but my understanding is, like a lot of others do, is that they are built to specs, requirements, wants of the individual scope companies which means the quality / functional ability of each brand of scope could be more or less than another and my understanding of the Antares scopes is that they are closer to the top end of the scale due to stricter controls / requirements of the company ! I have heard / read that a few times through the years from various sources and witnessed it personally with my two vs the half dozen other brands and sizes that I have owned and operated ! So semi or not I am very sure I will get a good scope for what I paid ie approx $300 C !