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  1. #1
    bcoley's Avatar
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    Default 2" diagonal purchase



    I am about to purchase a 2" diagonal. The two options highest on my consideration list are from Celestron and Baader Planetarium.

    While I expect the Baader diagonal to be of higher overall quality, I don't doubt Celestron's attention to detail, and I wonder whether the $125 price difference between the two items is a reasonable expense.

    The Baader diagonal reports 99% reflectivity, while Celestron promises 96% reflectivity. Does anyone know whether that's a distinction that will make a difference?

    The Baader unit has a few design pluses, such as a click-lock mechanism that simplifies changing out EPs, but again I don't how to factor that improvement into my purchase decision.

    Thanks for any advice you can offer.
    MY SETUP: Celestron Nexstar 8SE / SkySync GPS accessory / GSO quartz dielectric 2" diagonal / EYEPIECES: Celestron eyepiece/filter kit; GSO 2" 30mm; Russell Optics 2" 19mm SuperWide Konig XL; Russell Optics 2" 13mm SuperWide Konig; Zhumell 2" Barlow / Telrad finder / POWER: Celestron Powertank 7 / Peak Portable Power System 450 Plus (x2) / Celestron vibration suppression pads / Dew shield / Astro Zap dew strap w/power controller / Connection to laptop via Tripp Lite USA-19HS Hi-Speed USB serial adapter

  2. #2
    j.gardavsky's Avatar
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    Default

    Hello Bill,

    the reflectance is what matters, and what makes the price.
    The first hing I have relpaced on my refractor has been the diagonal. The dielectric coated diagonals are super.

    Best

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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  4. #3
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    Default

    Thanks, JG, for your helpful reply.

    After doing more research, I decided to purchase a GSO quartz dialectric 2" diagonal, one that was not originally on my list of options. From what I've read on various sites (including these forums), the GSO diagonal is a well built, quality item that should serve me well.

    The dielectric coating will make cleaning easier, while its 99% reflectivity will be a dramatic improvement over my existing diagonal, and perhaps even a bit of an improvement over the slightly more expensive Celestron unit I considered. I would loved to have ordered the Baader, but I couldn't justify the additional $140 given what I read about the GSO.

    Thanks again for your help.
    MY SETUP: Celestron Nexstar 8SE / SkySync GPS accessory / GSO quartz dielectric 2" diagonal / EYEPIECES: Celestron eyepiece/filter kit; GSO 2" 30mm; Russell Optics 2" 19mm SuperWide Konig XL; Russell Optics 2" 13mm SuperWide Konig; Zhumell 2" Barlow / Telrad finder / POWER: Celestron Powertank 7 / Peak Portable Power System 450 Plus (x2) / Celestron vibration suppression pads / Dew shield / Astro Zap dew strap w/power controller / Connection to laptop via Tripp Lite USA-19HS Hi-Speed USB serial adapter

  5. #4
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    Default

    The Dielectric Coatings are suppose to be much harder and scratch resistant.
    I got a Pro-Optic (Adorama brand.. probably GSO ) I am very happy with it.
    Ken H. sharing the sky with my 9yr old daughter
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  7. #5
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    Default

    You WILL not see any improvement with your eyeballs between the standard coatings and the dielectric...the human eye is just not that good...and can not see the slight difference...The major attraction of the dielectric coatings is like Fogfire stated...much harder and can hold up to repeated cleanings a lot better then the regular coatings...

    BUT then again just home many times have you really cleaned the mirror on your diagonal.. I'm **** about my astro stuff yet I only clean my diagonal once every 2 years or so... and my was not a problem when I purchased my Diagonal..Its a Denkmeier S1 Power Switch 2 inch diagonal with regular coatings and cost $500.00 ..dielectric models run close to $600 but I'm 68 and I do not need any diagonal to last 25 years...

    The GSO is a good diagonal..you will be happy with it...

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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  9. #6
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    Default

    Hello Bill,

    right decission what you have made. You can spend the USD 140 on the EPs, or on other nice things. My diagonal is quartz with 99% dielectric coatings, most probably China stuff, renamed by Teleskop Service. It is scratch resistant, and in case, I can clean it with whatever I just have in my hands.

    Looking forward to your report on your satisfaction, as this may also help others,

    JG

    Looking forward to your report on the GSO diagonal
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default

    I have three 2" diagonals - a celestron
    Mirror diagonal, a burgess
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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  11. #8
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    Default

    Lets try that again - accidently hit send while trying to edit something :-( I have three 2" diagonals - a Celestron Mirror diagonal, a Burgess dielectric, and the Baader clicklock dielectric. All work fine, and I don't notice any difference in reflectivity - I'm sure there is some, but it doesn't stand out for me. My favourite is the Baader - I really like the clicklock system, much easier than fiddly thumbscrews - but if you're on a budget, then it's difficult to justify spending the extra in terms of optical results. The other things to consider when shopping around are whether the diagonal comes with both SCT and 2" barrel connectors, which is useful if you have multiple scopes, and whether the 1.25" adapter lets you use 2" filters on it. But in general, this is one of the safer areas to go for a budget model.
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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  12. #9
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    Default

    Quote Originally Posted by bcoley View Post
    I am about to purchase a 2" diagonal. The two options highest on my consideration list are from Celestron and Baader Planetarium.

    While I expect the Baader diagonal to be of higher overall quality, I don't doubt Celestron's attention to detail, and I wonder whether the $125 price difference between the two items is a reasonable expense.

    The Baader diagonal reports 99% reflectivity, while Celestron promises 96% reflectivity. Does anyone know whether that's a distinction that will make a difference?

    The Baader unit has a few design pluses, such as a click-lock mechanism that simplifies changing out EPs, but again I don't how to factor that improvement into my purchase decision.

    Thanks for any advice you can offer.
    I think the GSO is the way to go! GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for Refractors
    -Greg
    Greg Wing - Clifton Park, NY http://astropaintings.weebly.com/
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  13. #10
    bcoley's Avatar
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    Quote Originally Posted by GWING View Post

    Thanks for the encouragement.

    I received the GSO diagonal on Monday of this week, but the first 2" eyepiece of my collection did not arrive until Tuesday. So, Monday night's epic observing session, chronicled in a post I made to the Astronomy Reports forum, employed nothing other than the 2" diagonal's 1.25" adapter.

    Whether it was my observing location, the diagonal's reflectivity, or a combination of the two, I experienced noticeable improvement in some objects -- much brighter planets, for example. But I also seemed to notice more curvature at the edges of fields of view. I need to redeploy the 1.25" diagonal to compare, but I don't recall such an obvious anomaly in the prior accessory.

    I'm anxious to try out the 2" EP when next the skies clear.
    MY SETUP: Celestron Nexstar 8SE / SkySync GPS accessory / GSO quartz dielectric 2" diagonal / EYEPIECES: Celestron eyepiece/filter kit; GSO 2" 30mm; Russell Optics 2" 19mm SuperWide Konig XL; Russell Optics 2" 13mm SuperWide Konig; Zhumell 2" Barlow / Telrad finder / POWER: Celestron Powertank 7 / Peak Portable Power System 450 Plus (x2) / Celestron vibration suppression pads / Dew shield / Astro Zap dew strap w/power controller / Connection to laptop via Tripp Lite USA-19HS Hi-Speed USB serial adapter

 

 
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