For some years iStar has produced achromat objectives with significant reductions in CA due to the glass used. IStar refer to these as: Anastigmatic objectives yielding reductions in CA of between 30 and 50%.
http://www.istar-optical.com/objective-lenses-ii.html
I built a 127mm f12 refractor using iStar's R30 127mm objective, which yields CA performance equivalent to a f15 scope. As you can see by the chart in the previous post, once you get into the green area CA is no longer an issue.