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Thread: Nikon S20x UW eyepiece

  1. #1
    j.gardavsky's Avatar
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    Default Nikon S20x UW eyepiece



    Hello all,

    one of the acquisitions during my last shoppings has been the Nikon S20x UW eyepiece for the Nikon stereo microscopes,

    Nikon UW S20x.jpg

    which has turned out to be a high performer with the densely packed optics elements in a minimum volume.

    Technical specs:
    f=12.5mm
    FOV: 68° estimated, field stop missing
    field distortion: light pin cushion
    lenses: high grade lens materials with minimum scattering of the green laser beam during the tests
    number of lenses: not identified with certainty
    multicoatings: amber
    barrel inside: black non-reflecting anodization, front baffle
    barrel diameter: 30mm
    total length: 41mm
    weight: 70.5g
    eye relief: estimated as 5mm

    Tests
    The eyepiece tests on the terrestrial targets with the 6" F/5 achromatic refractor have revealed a very high transmittance on par with the Zeiss B 40x f=12.8mm, and a remarkably good suppression of the CA.
    No blackouts and no kidney beaning.

    The main difference in its optics performance against the 300+USD wide field eyepieces is the slightly lower contrast and the cold (not neutral) color rendition, as show the pics of a village 3km away taken through the 6" F/5 achromatic refractor comparing the performance of the Nikon S20x UW against the Leica B20x WW (f=22mm),

    Nikon UW S20x vs Leica 20x not post processed.jpg

    at left is the picture taken through the Nikon eyepiece, at right is the picture taken with the Leica eyepiece.

    The pictures have been captured with the Lumix G7 camera, the scales have been adjusted, no other post-processing.
    The expensive Leica eyepiece delivers higher contrast, and higher color saturation, as expected

    Reference price on the ebay: 1 Pair Nikon Microscope S 20x S20X UW eyepieces for 30mm tubes | eBay

    All in all, this little Nikon may be regarded as a budget, small, and light-weight wide field eyepiece, for the grab-and-go telescopes.

    Test equipment:
    Green laser pointer
    Synta Sky-Watcher 6" F/5 achromatic doublet refractor
    Eyepieces: Zeiss Diascope D 30x/40x B WW f=12.8mm, Leica B 20x WW f=22mm
    Lumix G7 16 Mpix camera

    Best,

    JG
    DeanD, Bigzmey and Trombatissimo like this.
    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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    Default Re: Nikon S20x UW eyepiece

    Interesting ocular JG. Do you need an adapter or it fits straight 1.25" focuser?
    j.gardavsky likes this.

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    Default Re: Nikon S20x UW eyepiece

    Hello Bigzmey,

    an old film canister does the job at the moment.
    Should this eyepiece find a more frequent use, then I will look for an adapter.
    Best,

    JG
    Bigzmey likes this.
    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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