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Thread: A litte Wide field EP History

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    Default A litte Wide field EP History



    Found this on the Stellarvue website (yes, I've spent way too much time there lately...) and stumbled across this ES100 14mm page.
    There are few great nuggets of history in there about the development of "ultra-wide field" eyepieces and their origins I had no clue about.
    Yes, it is a vendor page but well worth the 2 minute read:

    Stellarvue EPWP10014

    U-boats & Cannons, who knew?
    Here's hoping some of our own EP historians will enhance the history lesson. (Professor JG, Gabby & nFA you out there?)
    Moving on.......

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    Default Re: A litte Wide field EP History

    There is also the Erfle, Galoc, Military Bertele, Dial Sight and Kaspereit to start the list
    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
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    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

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    Default Re: A litte Wide field EP History

    Quote Originally Posted by Gabby76 View Post
    There is also the Erfle, Galoc, Military Bertele, Dial Sight and Kaspereit to start the list
    Show off...
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    Bryan

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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    Default Re: A litte Wide field EP History

    Quote Originally Posted by Gabby76 View Post
    There is also the Erfle, Galoc, Military Bertele, Dial Sight and Kaspereit to start the list
    Well come on, give us the run down!
    In some ways I wish I hadn't found it - sooner or later there will be searches on the net and it will be 0400 before I realize what time it is....
    Moving on.......

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    Default Re: A litte Wide field EP History

    There are so many of todays eyepiece designs that are offshoots of one of those designs. Also a lot of good eyepieces that are no longer made can be found in auction collections/ dealers.
    I imagine that there is not a single astronomer that does not have an eyepiece that is based on a Zeiss design.
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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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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    Default Re: A litte Wide field EP History

    This is an interesting excerpt from that Stellarvue blurb:

    "Each and every Explore Scientific eyepiece is inspected both at the factory and again at our USA facility in California."

    Hmmmmmmmmmm
    Abb

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    Celestron Omni XLT 120, Explore Scientific AR102,
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    Default Re: A litte Wide field EP History

    Thanks Sketrip for bringing up the ultrawides to attention.

    Our not_Fritz_Argelander has somewhere posted a *.pdf file "EVOLUTIONofEYEPIECE", so we will get it again as soon as he jumps into the thread.

    The ES ultrawides have been hands-on qualified by Sven Wienstein, the guru #1 in testing the eyepieces
    and Barlows. What is Wolfgang Rohr in the telescopes testing, is Sven Wienstein (astronomie.de forum and his web pages) in the eyepieces testing.
    Please pay attention to the test of the 14mm Explore Scientific against the 13 mm Tele Vue Ethos, and especially to the last pic showing the X-rayed comparison, 14mm Explore Scientific - 13mm TeleVue Ethos
    The trick in the Ethos design is the double Smyth assembly in the eyepiece nose, sending an ultrawidened cone of light into an extra large aperture eyepiece.

    Some historical military ultrawide designs, still found on the markets in Germany, have been reviewed in Okular Test Vergleich und Beschreibung . They are essentially the Astroplan oculars, as used by our not_Fritz_Argelander during his times in the astronomy observatory. The Astroplans have been manufactured by Zeiss in Jena for the astronomy observatories back in the 60s and 70s.
    I am keeping my eyes open to get one of these old military or old observatory grade Astroplans for my vintage optics collection.

    The history of the Al Nagler's designs is here: The evolution of eyepiece developments at Tele Vue - Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets, Telescopes

    Best,

    not_professor_JG
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    Default Re: A litte Wide field EP History

    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: A litte Wide field EP History

    Quote Originally Posted by Shorty Barlow View Post
    That is the PDF which I previously posted so there is no need to repost again.
    j.gardavsky and sketrip like this.

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    Default Re: A litte Wide field EP History

    Quote Originally Posted by Gabby76 View Post
    There is also the Erfle, Galoc, Military Bertele, Dial Sight and Kaspereit to start the list
    Ray tracing diagrams for the Erfle, Plossl, and Orthoscopic designs suggest that Erfles should be excellent planetary eyepieces, btw. The width of the field such that the ray bundle is diffraction limited is larger in the Erfle. So if light scatter could be as well controlled...they should be excellent. I suspect that it's this wider AFOV of truly sharp performance that led to pushing the AFOV even wider.

    Also lets not forget wide field Konig designs which also had WW I military uses.

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