Thank you for your kind words.
I bought this lens to an Astromart member that not just sell me the lens but also help me with a bunch of questions than I have, he still mentoring me. His AP pictures are gorgeous, but he don't share his work so often.
You can find this lenses between 200 - 600+ it depends of the conditions, mine is an old one in great shape, like a good wine
When I was in need of one I post in AM that I was looking one and I get mine in less than a week.
I recently reprocess a picture of M31 that I took with this beautiful lens kind like 1 hour of integration I believe that 2 o 3 more hours and I will get something really nice with it. My next project is the Horse Head with it, I saw last week a CN guy publish one beautiful picture with the same lens stop it at f3 I guess... M31 Nikkor 180mm