What is this on the ATS scopes? (1 Viewer)

[Peregrine Took]

And another question about the ATS scopes.
85 vs. 86% transmission. Is that a comparison between 65mm and 80mm lens diameter or between 25-50 and 20-60x eyepieces? For me not really clear when I am looking on the swarovski website.

This might help. It's from the brochure download on the Swarovski website:

 

[ReinierB]

Thanks!
I was considering the ATS 80, but I bought the ATX 85 instead. I wanted 60x magnification and the larger FOV. The longer eye relief was also a plus.
Both really nice scope though!