Quote: ....Right now, there only seems to be one 2" prism diagonal on the market and it's expensive!....
There is more than 1.
At least 4 come to a quick search.
Do those include 2" Amici erecting-type diagonals?
If they're labelled "erecting" or "correct image", they
won't work as well for high mag. celestial use.
I was thinking of the conventional Baader 2".
Are there others readily available?