I was reading the article in S&T from 2018 and have some questions about eyepieces and Afocal.
Currently I have the 67mm (adapter inserted into the 55 TV Plossl) and a TV 40mm plossl for Afocal use. That's really the only a-focal options I have. Technically, I have my 24 pan setup for it (attaching a adapter to it), but supposedly it's not optimal for the setup.
When I want to look at Globulars I usually will use the 8 inch SCT which provides good image scale. I use my setup at prime focus and use a 2x barlow. This setup does very well, but is probably still a bit low in magnification.
If I use a 3x barlow it's usually too far and the view is better in a 2x barlow.
What would happen using something like a 7mm Delite for this situation (a-focal).
Has anyone experimented with a-focal and many different focal length eyepieces, even high powered ones? I think I would be able to do planetary nebulas also with some extra magnification. Such as seeing some detail in the Blue Snowball (obviously not blue anymore, but seeing some detail inside of it).