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  1. #1
    j.gardavsky's Avatar
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    Default 82deg Eyepieces: UWAN, Sky-Watcher Nirvana, Astro-Professional



    Hello all,

    below find some interesting correlation on the 82deg eypieces, possibly all of them coming from one and the same manufacturing plant,

    Skywatcher Nirvana
    The UWAN Eyepieces
    SkyWatcher Nirvana UWA 16mm Eyepiece 1.25"
    UWA Ultra Weitwinkel Okular 16 mm, 82°, 1,25\\\\\\\\\\\\\\\"

    I am using the Astro-Professional UWA 82deg 16mm, a pretty good eyepiece.

    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; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Ruud (11-06-2012)

  3. #2
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    Default

    Interesting ep!
    Do you use with the 2x barlow!
    How does she perform?
    Not bad on price!

    Steve...

  4. #3
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    Default

    Maybe we have finally gotten beyond the point where the same lenses are placed in different barrels and sold through different stores. {No sacrasm implied }

  5. #4
    j.gardavsky's Avatar
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    Default

    Quote Originally Posted by MitchAlsup View Post
    Maybe we have finally gotten beyond the point where the same lenses are placed in different barrels and sold through different stores. {No sacrasm implied }
    Here are the barrells the same, or very like the same!

    Back to the Barlow, I don't use it.

    Thanks for the inputs

    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; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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  6. #5
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    Default

    Quote Originally Posted by j.gardavsky View Post

    I am using the Astro-Professional UWA 82deg 16mm, a pretty good eyepiece.

    Best

    JG
    I like the 16mm very much. It is a very good binoviewer eyepiece.
    RCP Observatory
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    Eyepieces: Zeiss / Olympus / UO Konig / TeleVue / Siebert Optics Ortho's & Observatory 2"

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  8. #6
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    Default Re: 82deg Eyepieces: UWAN, Sky-Watcher Nirvana, Astro-Professional

    Hello JG

    I have the 16mm Nirvana, bought it from a shop in the Hague, last Saturday. United Optics makes them: Telescope_Accessrioes

    It's a nice eyepiece that makes the 16mm Nagler Type 5 look seriously overpriced. In the shop, I tried both in a small refractor to see if I liked their exit pupils. (I already have a Nagler 4.8mm that is very good, but uncomfortable to use because of exit pupil issues.) Eye relief on the Nirvana is 2mm longer than on the Nagler (12mm vs 10mm) and eye placement is easier because of the twist-up eye cup of the Nirvana.

    Barlow:
    I'm surprised how well it barlows . I've only had 3 or 4 hours to put it to the test and only tried a barlow when the seeing improved a little. I used my TeleVue 1.8x for a view of Jupiter at 169 times. A wonderful view! Half a degree wide. Sharpness was obviously excellent from edge to edge. All stars in the view were sharp. The moons were clean small discs and Jupiter showed a clean edge and three very prominent dark bands. There were hints of much more detail, but the seeing really wasn't good enough for this magnification. I was looking for flaws in the eyepiece.

    Without Barlow, on my Nexstar 6SE with its positively curved focal plane, I saw edge unsharpness in perhaps the outer 5% of the field. From there on the stars begin to look bigger than points and they become slightly elongated too. With the TV 1.8x Barlow this unsharpness disappears completely. This must be because Barlows add a negative curvature.

    I plan to do more tests by using the Nirvana with my 0.63x flattener/reducer on the 6SE, to see if that improves the outer edge like the Barlow does. I must also still try the Nirvana on my TeleVue Genesis (101mm f/5), which has a flat field by itself.

    So far I'm impressed with how well the Nirvana works. It's a keeper.

    I'll let you know later how it performs on the Genesis.

    Bye!

  9. #7
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    Default Re: 82deg Eyepieces: UWAN, Sky-Watcher Nirvana, Astro-Professional

    Hello Ruud,

    thanks for the helpful report and for the updated link to the United Optics. It looks like most of the stuff were increasingly coming from UO, I have been suspecting since some time.

    Back to the Barlows. Again, your findings have a good reason, and they are helpful. Some high-end Barlows may correct to by far the undercorrected combinations of the scope optics and of the eyepiece: you have offered a nice example.
    My general negative attitude towards the Barlows originates from the classical photography, where most of the teleconvertors have visibly degraded the pics quality (also Canon, Nikon). The only keeper I still have is the Leica APO 2x teleconvertor for the R SLR system, but its price is larger or similar if compared with the prices of the most 'standard' Leica R lenses.
    The second reason for my negative attitude towards the Barlows is due to their 'eating' the transmittance and contrast. This is visible on the faint fuzzy DSOs through the small apertures, like my 6incher. However, as with anything, the TeleVue Barlow will 'eat' much less than the cheap Barlows.

    Looking forward to your upcoming reports,

    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; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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