Don't forget that you get what you pay for John.
My Astrodon 5nms were not cheap but they are parfocal, top quality and a once in a lifetime purchase that have enabled me to achieve considerable enjoyment and some degree of success with my images.
At the end of the day though we must ask ourselves what is our motivation for taking space pictures and how much money do we want to throw at it?
What is the best bang for your buck?
Just m 2C worth
