Just thought I'd mention the proposed eyepiece dialog box at
http://www.projectpluto.com/future.htm#eyepiece
Consider this a "strawman" proposal. I'm open to other ideas,
but the general idea (a list of telescopes and of eyepieces, and you
select one from each column) seems perfectly reasonable to me.
(With possibly the ability to select more than one eyepiece,
getting more than one circle on-screen in the process.)
-- Bill