I had one of these Meade research grade 20mm's years ago ( orthoscopic x Erfel design ? ) and foolishly let it go as a freeby with a sold scope
, Flash and I am still kicking myself , great eyepiece it was , especially in my 10 inch f10 newt , perfect 125x for jupiter.
Things we do ??
sometimes .
Thanks for sharing this mate .
Brian.