Chip ma man, I think the issue regarding these glass types and what Jason B was trying to express is that these topics can be a bit more complicated than most are led to believe and sadly, many beginners get drawn into the marketing hype of just one type of glass. Certainly specific types of glass have superior optical properties to them, but sadly, some of this glass is not quite what others are led to believe it is either. What I suggest to others who have these types of concerns is to contact professional opticians or read real essays or journals written by opticians who can actually help others get a broader grasp of how a "complete" objective lens is made.
I love the internet, it's a great source of information, however, it's also an incredible source of misinformation. We all see a great deal of these threads where individuals post these questions about one scope has this glass vs another. Unfortunately, because there's so much emphasis placed on the name of just one piece of glass, people have a hard time taking their mind off it and when others continuously see it repeated over and over, they start to focus on only that one thing.
On a separate note, I've been spending some time looking through a 6" 1920's Zeiss objective Derek Wong acquired and IMO, it's as good as my FS152NSV. Imagine astronomers in the 1920's seeing world class lunar and planetary views like we see today.
Edited by Daniel Mounsey, 25 September 2020 - 09:13 AM.