Have spent 4 hours or so with the ES CC.
Scope is Orion Optics UK 10" f 4.8.
Feather Touch 2" focuser with 2.5" draw tube.
Eyepieces: ES 16 20 24 28 and 34mm 68º and XW 10 7.
Target for viewing the Southern Beehive and the Jewel Box.
With no CC the ES 68's start to be a mess around 60% out except the 20mm which is more like 80%.
Build on the CC is excellent, obviously made for 2" 100º eyepieces as there is no 1.25'' adaptor supplied.
With no instructions I followed what I do for using a CC with par focal rings, start with the ES CC screwed all the way out and focused til the centre stars were in focus and screwed the CC to til the outer stars were in focus, which meant the centre wasn't. Refocus and repeat til happy. For the 68's they all appeared pretty good at 20mm out in the ES CC. Nice stars virtually all the way across save the last 5% or less. In my f12 refractor the stars are pinpoint til 98% of the way out. The last bit is field curvature in the eyepiece as I see the same with the TV CC.
The XW's don't need the CC at all. With the CC the view gets worse!
So I'm happy with the ES CC, pinpoint stars 95% out is
in my book, transforming a reflector into almost refractor status.
It's a joy to cruise the milky way with the ES 34mm and the ES CC.
Photo attached is the ES CC in the FT focuser….a lot of back focus on this scope! An ES 20mm 100º eyepiece would stick out a long way from the focuser with this arrangement!
Matt