I summarize current BORG availability for new orders as follows. (This is not for the ones already ordered)
107FL : May
90FL : June
89ED : June
55FL : June or later? (I need more carefully check)
And 72FL : Prototype stage
7108/7215/7214/7872 : in stock
7880 : May
7770(=ED reducer for 107FL)/7771(=ED reducer for 90FL) in stock
Sorry for the inconvenience to you. Still way behind the schedule, especially 55FL. But getting slightly better. Thanks for your continuous patience.
I was told 72FL was refined for best matching with 0.72x super reducer. I will try to take some shots before NEAF if allowed or after. This is 72mm fluorite at F4 with total 6 elements configuration.
I will try to figure out best possible configuration as the double-duty scope for imaging as well as guiding.