I have nothing but praise for my
TeleVue Big x2 Barlow(2"). It has corrected the edge curviture of my GSO32mm(2")[crappy] EP to the point where I use it all time!, although it works like a 16mm here.
Not cheap though.....$335.00 from Bintel
, but one has to start forking out the big bucks sooner or later. Your setup is only as good as the weakest link, and I was determined that it would not be the barlow!