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Equipment Discussions >> Refractors

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Scott in NCModerator
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Reged: 03/05/05

Loc: NC
Re: Stardust Blue SV90TBV fluorite arrives! new [Re: jrbarnett]
      #5660053 - 02/03/13 02:06 PM

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.


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Rich V.
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Reged: 01/02/05

Loc: Lake Tahoe area, Nevada, USA
Re: Stardust Blue SV90TBV fluorite arrives! [Re: jrbarnett]
      #5660060 - 02/03/13 02:09 PM

Quote:

Is it really fluorite (as in the crystal) or low dispersion (ED) glass that happens to have some amount of fluorite in it (FPL-53, etc.)?




SV made a lot of these 90mm fluorite scopes over the last five years or so; back in 2007 I considered one but bought an 80S instead.

They only sell the FPL53 version now, though.

SV90TF info page

Rich


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