Thanks! It seems logical that the 100 should use the same glass as the 90 as it is not much more in price.
I have seen reports that the 100 has visually similiar ca correction as the Skywatcher ed 80 so I guess it is the mating glass that makes it so good. I have also seen a startest were it looks like the megrez 88 and 72 show less ca than the United optics/Kunming 102 F7 (Astro prof/Starwave/Ikharus/Orion) and 70 F6 (TS):
http://www.teleskop-austria.at/infor...pochromats.jpg
I want it both for visual and photo. The few images I have seen have been through mono cameras with rgb filters so the CA will not show.