Thanks Astro, great reply and much appreciated
. Another question, slightly off topic to my original query but I'm trying to figure out what premium eye pieces to buy without breaking the bank -
The Televue Ethos'es and the like are expensive - am I too far off the mark in assuming that a 17mm Ethos with a good 2X barlow (giving 8.5mm) isn't too different (optically) than using say an 8mm Ethos by itself?
I remember reading somewhere that some contrast is sacrificed when using a barlow but is this and other optical differences neglibible comparing the barlowed 17mm and the 8mm by itself?