Hi Jim, this will be the third Stardust Blue scope that I've owned over the past several years (but I've seen several others owned by other people as well). In all of them the color and finish of the main OTA matched up with the color and finish of the dewshield. What I don't know is whether or not SV may have changed the Stardust Blue color or finish slightly over the years. Since you bought your SV80S used, I wonder if the main OTA and dewshield were originally parts of two different scopes?
Just a guess.
Re: the lens material of my SV90TBV, the ED element is true fluorite crystal, i.e., CaF2, and not a "fluorite-like" type of glass. But SV does produce a version of this scope using FPL-53 as the ED element. The lens cell is slightly different in the two versions, but other than the inscription on the lens cell, the scopes otherwise look pretty much the same, and are said by SV to be optically identical. I've only looked through one other fluorite SV90T though, and have never looked through a non-fluorite SV90T before.