|
A single eyepiece will always give at least a slightly better viewing
experience than an EP+ barlow. Given that, if you look at what a 3x
does for you, this is what you get.
Your 20mm + barlow becomes 6.66mm which you already have covered
with your 6mm EP, so no point.
Your 10mm becomes 3.33mm which would give a magnification that
could be used only occasionally when the seeing permitted.
Your 6mm becomes 2mm which would give a magnification too
high to ever be used.
raymo
|