Hallo all. When I first started observing as a kid I used a cheap
refractor with an equally cheap prism star diagonal. I can't recall
having any problem with the reversed, upright, image when navigating
by eye or using charts. After a break from astronomy of some years, I
now find using a diagonal a pain in terms of navigation, with or
without maps/charts - I find even the moon irritating to explore.

Could it be that my brain has aged and is now less able to make the
mirror-image correction as to relationships between physical features?
Has anyone else here experienced this phenomenon? Luckily perhaps,
I've never regularly used a scope with an inverted image, though I'm
guessing the adjustment is less "difficult" compared with a
mirror-image.

If it turns out that I am indeed on the verge of senility :-) are any
correct image star diagonals available of sufficiently good quality
for astronomy?

Regards,

Anthony