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Thread: A litte Wide field EP History

  1. #11
    not_Fritz_Argelander's Avatar
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    Default Re: A litte Wide field EP History



    Quote Originally Posted by AbbN View Post
    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
    I don't doubt it. That is their procedure with objective lens sets as well.
    j.gardavsky likes this.
    Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG

  2. #12
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    Default Re: A litte Wide field EP History

    Quote Originally Posted by j.gardavsky View Post
    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.
    I'm late to the party, Shorty Barlow has it covered.

    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.
    Thanks for the interesting read. It contradicts my experience that scattered light is better controlled in the Ethos. Perhaps there was an issue with my sample. In any case it also reinforces my sense that the difference in quality was not worth the price difference.

    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.
    Excellent.
    j.gardavsky and sketrip like this.
    Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG

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  4. #13
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    Default Re: A litte Wide field EP History

    Quote Originally Posted by not_Fritz_Argelander View Post
    I'm late to the party, Shorty Barlow has it covered.
    Yeah, remember what they say; the early bird gets eaten by the cat, or something. lol
    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
    Yeah, remember what they say; the early bird gets eaten by the cat, or something. lol
    In this case I needed a break from insomnia, so it was a good thing.
    Shorty Barlow likes this.
    Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion Sirius EQG

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    Default Re: A litte Wide field EP History

    Think many APO makers are still using cannon barrels for telescope tubes. Why are they so heavy?
    Newtman but some refractors allowed.

 

 
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