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Thread: f=30mm ultrawide 2" eyepiece

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    Default f=30mm ultrawide 2" eyepiece



    Hello all,

    I have just received from one of the astronomers in Germany this really big EP,

    f 30mm Wild Heerbrugg Swiss ultrawide 2inch.jpg

    This eyepiece, manufactured by Wild in Heerbrugg (Switzerland), has been repurposed from a probable use in the Swiss Army by an adapter to the 2" astronomy standard.

    Optics
    Multicoatings: Blue and yellow/orange
    Lenses: (field stop - 2 - 1 - 1 - 2), field lens diameter 44mm flat out, eye lens diameter 33mm concave out
    Field stop: Sharp, no color fringing
    AFOV: Estimated as slightly above 80°
    Eye relief: Very short, but still comfortable for anyone got used to the short orthos

    The lenses system looks like an asymmetric remake of the old Leitz Astroplan, and it is expected to work fine on the fast refractor optics.

    Technical specifications
    Body: All metal, fine helical focusable
    Adapter: Screw-in 2"
    Total lengths: 100mm
    Maximum diameter: 70mm
    Total weight: 714g

    First light through the 6" F/5 Synta (Sky-Watcher) achromatic refractor on the terrestrial targets

    A very comfortable use and viewing.
    Internal blackening and baffling: Excellent, no stray light seen
    Distortion: Visible pincushion I can live with
    Color rendition: Slightly warm, but it's the golden October now
    Contrast and color contrast: high
    Sharpness: Very high within 95% edge-to-edge


    At the moment, I am considering 2 options how to use this EP:
    - As I have fixed the 1.25" filter wheel on the diagonal as my most used observing standard,
    I can consider a second diagonal for this EP.
    - This EP might also deserve its own refractor for the richiest field views.

    Adding this EP to my arsenal seems to be a good decission,

    JG
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    Default Re: f=30mm ultrawide 2" eyepiece

    An interesting eyepiece JG, I will be looking forward to your further impressions with it.
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    Default Re: f=30mm ultrawide 2" eyepiece

    Always interesting, JG.
    j.gardavsky likes this.

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    EQG

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    Default Re: f=30mm ultrawide 2" eyepiece

    Quote Originally Posted by j.gardavsky View Post
    (...)
    I can consider a second diagonal for this EP.
    - This EP might also deserve its own refractor for the richiest field views.

    Adding this EP to my arsenal seems to be a good decission, JG
    Nice piece of new equipment!
    It may be a bit the world upside down? First an eyepiece and than buying a refractor.....
    On the other hand, (the second diagonal) a field of more than 3 degrees with an exitpupil of 6 mm.....together with the B RGB (CCD) filter, makes it a serious hunter for extensive nebulae. Sounds promising.

    Good luck with the new one and above all clear skies!
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    Default Re: f=30mm ultrawide 2" eyepiece

    Welcome to the glass grenades club JG!

    Quote Originally Posted by j.gardavsky View Post
    - As I have fixed the 1.25" filter wheel on the diagonal as my most used observing standard,
    I can consider a second diagonal for this EP.
    - This EP might also deserve its own refractor for the richiest field views.
    JG
    Or you could bight the bullet and upgrade your scope to 2" wheel.

    j.gardavsky and Makuser like this.

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    Default Re: f=30mm ultrawide 2" eyepiece

    Quote Originally Posted by Bigzmey View Post
    Welcome to the glass grenades club JG!



    Or you could bight the bullet and upgrade your scope to 2" wheel.

    Hello Bigzmey,

    the 2" filters, I mean a full set of filters including one from Astrodon, would be a bullet hard like $1,500 - $2,000
    if not even harder.

    For the time being, the EP decorates my desk,

    JG
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    Default Re: f=30mm ultrawide 2" eyepiece

    Hi JG. Wow, this is a great addition to your eyepiece collection. I remember in the 1970's, A. Jaegers Optical used to buy high quality military surplus optics and remount them into the 1.25" astronomy telescope standards. Congratulations on the new large glass "pineapple" optic JG, and the best of regards.
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    Default Re: f=30mm ultrawide 2" eyepiece

    Hello Marshall,

    and thank you for your comments.

    Repurposing the military surplus optics for the astronomy use is still quite popular, like here
    https://www.ebay.at/sch/astrooptik/m...p2047675.l2562
    and among others, you can get at 'astrooptik' the prisms from Rodenstock in a precission quality well above that what we are getting on the astronomy markets for higher prices.

    Wild in Heerbrugg used to be an optics company with the highest reputation. Some time ago, Wild has been 'eaten' by Leica,
    during the time as the Leica branches have also 'eaten' Reichert, and others.
    Since that, Leica has outsourced quite a lot of manufacturing to China, but at least, they indicate it on their products.

    Regarding the price point, the military surplus eyepieces, and other optics, cost a fraction of what we are paying for the 'generic' optics manufactured in China, or assembled in Taiwan, or labelled by 'JAPAN', to avoid the higher taxation on the goods exported directly from China.

    Best,

    JG
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    Default Re: f=30mm ultrawide 2" eyepiece

    Hi JG,

    If you can get your hands on an Explore Scientific 30mm 82° AFOV EP, I would love to see you do a comparison between those two eyepieces.

    Cheers,
    JT
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    Default Re: f=30mm ultrawide 2" eyepiece

    Hello JT,

    and thank you for the suggested shootout.
    Unfortunately, ES comes through Bresser and other vendors for extraorbitant prices,

    https://www.bresser.de/en/Astronomy/...ce-30mm-2.html
    https://www.teleskop-express.de/shop...sserdicht.html

    and I have purchased the Wild just for 1/3 of ES.

    Both of them have 6 lenses in 4 groups, but the net weight difference 995g (ES) against 714g (Wild) lets me guess, that Wild has taken thinner lenses from special glass materials, to avoid the added sperical aberration due to the thicker lenses with high surface curvatures, among other problems all ultrawide EPs have or may have.
    Wild is also free from any blackouts and/or kidney beaning, even if the blackouts and kidney beaning in the long focus ultrawides should be less common.

    On the other hand, I have not heard about people using the ES ultrawides around, otherwise, I would try to meet somebody.

    However, anyone is welcome to come over with his/her ES to make together with me a shootout.

    Best,

    JG
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