[wulfgar]

Originally Posted by LewisM

Now a 2/3 Vixen stable, with only the ED80 being the black sheep May sell that to afford some more Vixen accessories

You might be giving ED too bad a rap. There's low end ED used in the Synta and a variety of cheaper products. And high end ED used by the famous name fabricators.
Curious that Vixen has the Synta 80ED and 100ED badged with their own label. And their more home grown counterparts which I assume use high end ED in their doublet crowns. The ED81s and ED103s, both which a priced at double the Synta counterpart. At F7.7 the ED103s has gone the way of the compromised photo/visual. And now they got a new model the AX103s that has a basic triplet with an inbuilt field flatterer, advertising itself as made out of the "fabled" FPL - 53 variety of ED. But again this latest instrument is very much the compromised photo/visual.
The ED100 appears it might offer some good visual refractor bang for buck and at F9 in would make an interesting comparison with the 102 Fluorite F9.
The Vixen Fluorite offers fine contrast with a single airy disk ring that's like a thin spiders web around around the central airy disk. Further airy disk rings get so little light that they just aren't visible in the Fluorite.
The Synta ED100 with its lower end ED I could assume would offer CA in league with a classic 4" F15. This would result in airy disk rings that are colored and much, much thicker than that of the Fluorite.