On Mon, 14 Apr 2008, Alexis Cousein wrote: > Dominic-Luc Webb wrote: > > You also get coma and astigmatism off-axis with a sphere - though > the spherical aberration usually dominates the coma until you > get quite far off-axis, it's there. Are you saying coma is the same for both? Dominic _______________________________________________ ATM mailing list http://www.atmlist.net/