Val wrote : <snip> > There may be some gains to be had above 1/10-wavefront SYSTEM > quality. . .and maybe I will live long enough to SEE one of those > things!! But for now, well, no. Why not ? Take your #3 scope (or #4, if you have one), and place a 2" off axis mask. Presto ! 1/10 wave system scope (probably much better). Bratislav