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  1. #1
    dmbryan's Avatar
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    Default dielectric diagonals ?



    Most of the info I have read about diagonals say the cheaper ones reflect 94-96% of light and the dielectrics reflect 99%. Is there a large difference in brightness and or clarity with the 3-5% increase? Thanks, Derek.
    name: Derek

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    Hi Derek! Best I can offer is all we can gain is to the good. A few percentage points may not sound like much but with averted vision that can make the difference. I can't say that going to dielectrics with my diagonals has made all the difference in the world but it sure hasn't hurt .



    Bob
    6 inch F/5 GEM mounted reflector

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  5. #3
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    Default

    Thanks for the input.
    name: Derek

    Various scopes and such.

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    Default

    Hi Derek. I went with the Williams Optics carbon fiber 2" diagonal. To be honest I really couldn't tell if there was any improvement. It was small if there was. I had intended to do a comparison with my old and new ones just for my own learning experience but just never got around to it. I intended to view the same object using the same eyepiece and interchange the diagonals to see if I could see the difference. Best of intentions... It would be interesting to hear if any of our other members have done this. If I ever get a good night out again I'll try to remember to give it a shot.
    Len
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    8 inch reflector f/4.9 - VRC8 (RC Mod for Mallincam)
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    Default

    Hi DM ...I noticed a difference with the stellarvue dielectric 2in. But i am comparing it to a 1 1/4 standard meade ...Mabey size does matter ...LOL..
    16in Night sky
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    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
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  10. #6
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    Default

    I bought the 1.25" Stellarvue dielectric and I noticed the slightest improvement in the sharpness over the stock Meade diagonal. The other thing to consider is that the Stellarvue is easy to align or adjust since the mirror is collimatable and the dielectric coating is much more stronger thus it is easier to clean the mirror without damaging it.
    Anthony Rogers / stargazertony@facebook
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  12. #7
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    Default

    Thanks for the info.
    name: Derek

    Various scopes and such.

 

 

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