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Thread: Dielectric Diagonals

  1. #1
    cosmicbeach's Avatar
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    Default Dielectric Diagonals



    I think its about time I purchased a new diagonal for my scope at the present time the one I have is a dielectric.
    My question is are these just a gimmick or does having a dielectric diagonal really improve the view.
    I personally couldn't see much of a difference.
    Scope = Celestron CPC800 8"sct. Sky-watcher Heritage 130p flex tube Dobsonian Binoculars = Helios Ultima 10x50 porro prism.
    Eyepieces = Baader Hyperion Aspheric 31mm and 36mm. Baader Hyperion 8mm, 13mm, 17mm, 21mm and 24mm.
    Diagonal = 2" Altair dielectric diagonal.

  2. #2
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    Default Re: Dielectric Diagonals

    I think that it's not so much an improvement in viewing, as it is a better overall coating that will hold up longer than a standard coating.
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    Jim
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  4. #3
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    Default Re: Dielectric Diagonals

    I just took a look at the one that you have listed and it is a decent diagonal.
    As you go up in quality it does make a difference with better applied coatings and flatness of the surface and less light scatter.
    Unfortunately that extra quality comes with a higher price.
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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  6. #4
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    Default Re: Dielectric Diagonals

    As Gabby indicated you already have pretty good diagonal. Moving to a premium quality dielectric will give you more clear aperture, better fits and finishes, better stray light control and potentially better coating and mirror finish. Also they can handle better heavier EPs, and hold collimation better. All for 3-4x increase in price. Trained eye will likely see some differences, but they will be incremental, not revolutionary.

    At this point instead of getting another dielectric I would recommend to try Baader T2 prism diagonal. It will be a good match for your F10 scope. T2 is limited to 1.25" EPs only, but you will see noticeably less light scatter. This means cleaner looking star clusters, more details on planets and easier splits of double stars.
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  7. #5
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    Default Re: Dielectric Diagonals

    10538 and SpyderwerX like this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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  9. #6
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    Default Re: Dielectric Diagonals

    As others stated, the "dielectric" is referring to the protective coatings on the mirror surface itself. Of course, like any optical coatings, can vary greatly from each manufacturer, or from fabrication specs from the vendor/supplier. So the name 'dielectric' in itself doesn't really tell you anything other than the mirror has a protective surface coating.

    I do like the T2 Zeiss spec prism from Baader, but my favorite overall diagonal is the full size Baader BBHS. I can't claim to have used every diagonal out there, but of the ones that I have, it is by far the best. A little review from the Baader site by Bill Paolini: https://baader-planetarium.uk.com/en..._w_paolini.pdf
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    Default Re: Dielectric Diagonals

    Quote Originally Posted by Gabby76 View Post
    I've been debating the T2 amici version for lunar observing. Does that make me a 'lunatic'?
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    Default Re: Dielectric Diagonals

    I use my prism for lunar and planetary, it gives amazing views.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    Default Re: Dielectric Diagonals

    Hi Cosmicbeach. I have a 1.25" dielectric diagonal on my Mak-Cass telescope, and 2" dielectric diagonals on my 120mm and 150mm refractors. I am not sure if the 99% reflectivity is that noticeable on observing, but it may help when using low transmission factor color filters. I bought mine primarily, as jimminCT (Jim) stated, for the extended tarnish time of the silvered reflective backing. I hope this helps Cosmicbeach, and the best of regards.
    - Marshall

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