As I've mentioned here before I'm pretty new (18 months) to this hobby. So a while ago I had a mishap and put a crack in the plastic EP housing in my Celestron 102 refractor. I decided to get a new dielectric coated model, even though the old one successfully super-glued. I knew that most flip the image left-to-right, like any mirror. But I'd forgotten that after 18 months of observing. I was then surprised to find that with the new one, objects now traveled west to east in the sky
. The diagonal shipped with the scope is bulb shaped and objects seem to travel normally east to west. I prefer the new one - the images are sharper but, can anyone explain this, probably obvious, feature of the original diagonal?
Chris.