To follow on within the thread, it set me thinking and looking for eyepiece No.1 a 20mm Bresser RK (Rank Kellner / Reverse Kellner?)
I found it last night, arrived with my 90mm Bresser Achromat in the 1990's.
It took my breath away at the time looking at The Moon, consigned to the bits box long ago, so thought why not.
Well surprisingly good, long eye relief and very sharp on axis, off well, not,
but who cares this eyepiece was my first and will now be loved a little bit more.
So pointed back at The Moon just before Clapping at 8pm.
Oddly mounted in something a bit more exotic than the long departed Bresser, which had great glass but an awful focuser.
As a PS, added 30 mins later:
I in a fit of sentiment trialled the 2x barlow, it was as awful as I remember it!
The 12.5 Kellner had my eyeball on the lens,
The 9mm RK was ok as well.
Thanks Ags for this trip down memory lane and some additional fun at the scope 👍