Well, looks like I have some humble pie to eat, Matt,
Very interesting set of results. Interesting to note that the 'inexpensive' prism diagonals just didn't cut the mustard. I think it is most people's experience with these that has given prism diagonals a poor wrap, including with me. I have had three such diagonals that have come with different scopes I've picked up over the years. All have been poor & all cheap. I don't use these at all.
Most interesting for me is that the better prism ones showed less scatter with bright objects. I am always conscious of the scatter I see with the Moon in my C8 - still very sharp with seeing being good. The Moon is a very different beast to Jupiter. I wonder if a difference is noticeable here. Matt, any experience?
Thanks for the article, Matt. Like you said, these are application dependent. No compulsion for me to change though with my scopes and how I use them - considering the article!
Alex.