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Thread: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

  1. #1
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    Default Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT



    Hello all,

    The Fujiyama f=5mm is intended to fill the gap as left by the Pentax XW 3.5mm and 7mm in my arsenal for the planets, Moon, and for the double and multiple stars.
    The BCO f=6mm finds most of its use on hunting the details in the bright nebulae and galaxies.
    Thesse both eyepieces will also find their use on the globular clusters.

    Thanks to not_Fritz_Argelander, and because of the delivery problems in the Old World, I have speeded up my decision for the Fujiyama.

    The first picture shows the wrap with invoice, and the Fujiyama eyepiece with the box,

    Fujiyama ortho 5mm unwrapped.jpg

    The both eyepieces, the BCO 6mm at left, and the Fujiyama 5mm at right, are shown in the next picture,

    Fujiyama ortho 5mm against BCO 6mm.jpg

    The both eyepieces are delivered with protecting caps, not shown in the picture.
    Whereas the BCO is delivered with a rubber eye guard, the Fujiyama is just without.
    The access to the eye lens in the BCO is quite comfortable on the ‘vulcano’, the Fujiyama offers just a shallow ‘dent’.
    The right side in the picture shows the inner life in the shells (tubes) of the both eyepieces.
    The both shells are fine threaded for the 1.25” filters, and with enough clear space to screw in the Baader triplet Barlow from the Q-Turret set.
    The lens cells in the both eyepieces follow the Carl Zeiss Jena (CZJ) concept of the optics assembly, like in the old CZJ orthos for the Asiola/Telementor telescopes.
    The Fujiyama has a better blackened interior in the shell, the BCO is simply anodized.

    The more significant difference between these both eyepieces is their optics.
    Whereas the Fujiyama is close to the Abbe ortho like in the discontinued Baader Genuine Orthos series, and remade for the glass materials as available in Japan, the BCO with its larger field of view (52°) and longer eye relief is a later development of the Abbe ortho, suspected to be made by the designers in Jena using the today’s Schott glass materials.

    Another difference is in the multicoatings.
    The Fujiyama reveals the the blue-green-amber multicoatings, as used e.g. by Nikon to balance a strictly neutral color rendition on the lens materials as used in the Far East.
    The BCO has the new HT (high transmission) multicoatings with less visible color reflections to pull most of the light through the optics.

    Turning the both eyepieces against the bright skies, the difference in their optics designs becomes immediately obvious.
    The Fujiyama reveals a sharp circa 40° AFOV field stop without any fringing.
    The field stop in the short BCO is missing – the field fades outside the 52° AFOV suddenly away. (Other BCOs have a 52° field stop)

    Regarding the eye relief, on first time using the Fujiyama, it may turn out to be tricky to find the best distance between the observing eye and the eye lens to see the full field and to see it homogeneously illuminated. This won’t play much role when viewing the planets, the craters on Moon, and the double stars, but a strictly homogeneous brightness of the field of view would be required when observing the faint fuzzy DSOs.

    Surprising on the Fujiyama is the off-axis scattering of light on the not blackened rim of the eye lens, making a well visible ring with a diameter between 50° and 60°.
    In the not properly baffled and otherwise protected fast telescopes against the stray light sources, this scattered light may interfere when the observing eye is close to the eye lens. This scattered light ring is also present in the BCO, even if not as much pronounced.

    These both eyepieces are a great choice on budget if compared with the discontinued overprized ZAO I and ZAO II, or even the Carl Zeiss Jena orthos, probing the 1,100 USD benchmark on the 2nd hand markets, like this one https://www.ebay.de/itm/Carl-Zeiss-J...MAAOSwWxNYuCI~ at the Mikroskop-Business shop.

    A shootout of the both eyepieces on the 6” F/5 Synta achro will come as soon as the weather allows.

    Thank you for reading,

    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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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    The 5mm Fujiyama was the most recent I bought and completed my set of orthoscopics.

    5mmfuji.jpg
    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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  5. #3
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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    I'm going to have to take another look at my 5mm....
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    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
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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    Hello not_Fritz,

    sorry for putting a warm into your brain.

    The scattering from the lens rims is the first thing I check when looking through the EPs.
    If yes, then I look at what distance of my observing eye I won't see it.

    All we need is baffles, la, la, la ...

    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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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    It's OK. One more worm won't be noticed.
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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    Thanks JG, I'll look forward to hearing how they go with the Synta scope.

    That price for the used Carl Zeiss ortho is crazy! For that I can get a full set of the Fujiyama orthos (4, 5, 6, 7, 9, 12.5, 18 and 25mm), and round it off with a Takahashi LE30 and still have some change!

    Have fun with your comparisons.

    - Dean

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  9. #7
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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    Quote Originally Posted by DeanD View Post
    Thanks JG, I'll look forward to hearing how they go with the Synta scope.

    That price for the used Carl Zeiss ortho is crazy! For that I can get a full set of the Fujiyama orthos (4, 5, 6, 7, 9, 12.5, 18 and 25mm), and round it off with a Takahashi LE30 and still have some change!

    Have fun with your comparisons.

    - Dean
    Hello Dean,

    there is quite a lot of hype about the old Zeiss eyepieces.
    But this one, the Carl Zeiss Jena magnifying glass
    https://www.ebay.de/i/381986730135?chn=ps
    tops even the Zeiss eyepieces when you take the price/value ratio into account.
    I have this magnifying glass, it used to cost 20 bucks on the flee market behind the Lorenz Church in Nürnberg.


    Today, I have tested the both orthos on the 82mm F/5.4 Leica APO Televid, tomorrow I'll run the test on the 6" F/5 Synta achro.

    Stay tuned,

    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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    Default Re: Fujiyama HD – OR 5mm side by with Baader BCO 6mm HT

    Hello all,

    it has finally stopped raining yesterday, and today we have got some well deserved sunshine, to test the both orthos on the 6" F/5 achromatic Synta.
    The test targets have been the houses down in the valley, about 1,000 meters away, and in the near field a roof about 60 meter away.

    Under the cloudy skies on yesterday, the Fujiyama 5mm and the BCO 6mm have performed comparatively, just at their different magnifications of 150x, and 125x.
    These magnifications are still not enough to cross the diffraction limit of the 6" aperture.

    Today, under the bright sunshine, the Fujiyama 5mm has revealed a slightly higher contrast on the finest details on both of the targets.
    So, I believe to have noticed what not_Fritz_Argelander has promised about the better contrast performance of the Fujiyama.

    Tests under the night skies will be done, as soon as possible.

    Thanks for reading,

    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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