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Thread: Is either of these substantially better than the other?

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    Default Is either of these substantially better than the other?



    I'm looking at either the Celestron XLT coated 2" diagonal or the GSO 2" 99% quartz dielectric diagonal. There is a $30 difference between them but I'm more interested in if quartz dielectric is better than the XLT coating or vice verse ...
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    Default Re: Is either of these substantially better than the other?

    I've never done a side by side comparison, but I can say the GSO is excellent.
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    Default Re: Is either of these substantially better than the other?

    You won't go wrong with either. Both are top quality.
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    Default Re: Is either of these substantially better than the other?

    While I have not used the Celestron 2", I did replace the 1.25" that came with my XLT AZ 102 with the 2" GSO you mentioned. Now the 1.25" diagonal that was included was a correct image and nothing like the 2" XLT diagonal this shouldn't be taken as a direct comparison, but I am extremely happy with the GSO.
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    Default Re: Is either of these substantially better than the other?

    Sounds like I can sVe myself $30 and be very happy ...
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    Default Re: Is either of these substantially better than the other?

    Hello Nimitz,

    quartz is the substrate, better than a sort of Pilkington float glass (ha, ha).
    My diagonal is 99% reflecting dielectric on quartz with the TS label, and it is most probably from GSO.
    I am very happy with it.
    Best,

    JG
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    Default Re: Is either of these substantially better than the other?

    The other advantage to the GSO is if you ever get a refractor, you can buy this GSO Chrome Barrel from 2" GSO Refractor Diagonals
    and convert it.



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    Default Re: Is either of these substantially better than the other?

    I have 2 quartz GSO's: one for my CPC800, and one for my refractors. I am very happy with them: in fact the one in the CPC800 improved the view considerably from the supplied diagonal. I started seeing text-book stars at high power instead of fuzzy blobs...

    I also have a Takahashi 1 1/4" prism diagonal, and I can't tell the difference between it and the GSO.

    If the GSO is cheaper, I don't think you will be disappointed.

    Good luck,

    Dean
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    Default Re: Is either of these substantially better than the other?

    Agreed, and since it has an adapter for 1.25 I won't need to use the cheap that came with my scope any more even foe 1.25 EPs ...
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    Default Re: Is either of these substantially better than the other?

    Dielectrics have more light scatter. You can see the difference on planets at low power, those 37 layers.
    Enhanced aluminum and especially prisms have less scatter. Not a lot of difference between the 3, but it is there if you look for it.
    Newtman but some refractors allowed.

 

 
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