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Thread: The 25mm EPs Group: Leitz Periplan GF 10x, ZEISS W 10x (46 40 03), and Tele Vue 25mm

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    Default The 25mm EPs Group: Leitz Periplan GF 10x, ZEISS W 10x (46 40 03), and Tele Vue 25mm



    Hello all,

    on last Friday, I have consolidated my f=25mm EPs Group adding the Leitz Periplan GF 10x,

    Leitz Zeiss Tele Vue.jpg

    The Leitz Periplan GF 10x,

    Leitz Periplan GF 10x.jpg

    is together with the Leitz Periplan GF 12.5x the second Leitz EP in my arsenal for the 6” Synta (Sky-Watcher brand) F/5 achromatic refractor.

    Technical specifications:

    Periplan GF 10x Leitz Wetzlar Germany
    Focal length: 25mm
    Tube diameter: 0.965“, length: 52mm
    Weight: 45.5 g
    GF: grand field of view 42° (estimated)

    Similarly to the Leitz Periplan GF 12.5x eyepiece already included in my arsenal, Leitz Periplan GF 12.5x (f=20mm) Eyepiece
    this EP has been designed and manufactured to compensate the chromatic aberration on the green and blue wavelengths down to the UV (as far as transmitted), as required for the fluorescence microscopy. It has been also designed and optimized for the maximum contrast and resolution on the blue wavelengths, as the resolution limits scale with the wavelength of light.

    Optics design
    The optics design of this eyepiece is that of the ‘classic’ Leitz Periplan:
    The front field singlet generates an intermediate image across the plane of the field stop.
    The image is further processed by the eye lens group consisting of a single lens, followed immediately at the smallest distance by another doublet. The last lens surface in the doublet is concave towards the observing eye,

    Leitz Periplan optics design.jpg

    From: Leitz Mikroskope abbildende_beleuchtende_1973.pdf,
    listed by Ernst Leitz GmbH under the # 512-99a

    The lens surfaces have antireflective amber multicoatings.

    The ray tracing with the green laser pointer has been a bit difficult, as the laser beam leaves in the high grade glass materials, as typically used by Leitz, hardly any trace of scattered light. Moreover, the lens surfaces have low curvature and small thickness.

    ZEISS W 10/25 eyepiece

    This eyepiece enjoys still some popularity in astronomy thanks to the buyback by APM and others from the microscopy surplus sheds in Germany, and re-exports to the U.S., Japan, etc.
    My piece came in pair together with the ZEISS (West Germany) 47 50 57 stereo microscope into my possession.

    Technical specifications:

    ZEISS West Germany (46 40 03) W 10/25 eyepiece with dioptric adjustment
    Focal length: 25mm
    Tube diameter: 30mm, length: 61.5 mm
    Weight: 135.9 g
    Rubber eyeguard optional
    Field of view 60° (estimated)
    Multicoatings: bue-violet

    Optics design
    The main group is a cemented doublet, followed by a single plan-convex eye lens with the planar surface towards the eye. So, the design is pretty simple, minimizing the light transmission loss.

    Tele Vue 25mm Plössl EAP- 25.0(engraved with Japan)

    The Tele Vue 25mm Plössl is a ‚classic’ Plössl with two cemented and symmetrically oriented crown/flint doublets.
    With its focal length, it is the working horse on the fast telescopes when hunting the low surface brightness objects in the night skies.

    Technical specifications are listed in: Tele Vue Optics: Plössls

    The shootout of these 3 EPs will start as soon as the weather permits.

    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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    Default Re: The 25mm EPs Group: Leitz Periplan GF 10x, ZEISS W 10x (46 40 03), and Tele Vue 2

    I have some 25mm EP's. Mainly Plossls, although the 25mm Astro Hutech orthoscopic here is part of a bino pair.

    25's.jpg

    The Vixen NPL and the TeleVue are probably the best all round Plossls and work well in any scope. The Orion Sirius was a giveaway with my 90mm Orion Maksutov, I'm fairly convinced it's Barsta (BST) made. Apart from eye lens sizes and overall housing design there isn't a huge difference between any of the Plossls.

    Although I think the GSO is probably better in scopes of f/5 and faster than the Orion Sirius. My favourite is probably the Vixen NPL. The TV is a beautifully made eyepiece, but I'm not too keen on the rubber eyeguard design. So for purely ergonomic reasons the NPL wins over the TV in that respect. As far as I can tell they produce identical images (I've tried them side by side). The NPL has an odd plastic click-stop twist up eyeguard, I'm not over keen on that either lol, but I find it quite easy and comfortable in use.

    I have several orthoscopics, it's difficult to beat the sharpness, clarity and contrast of a good orthoscopic, the major difference is the FOV of 42° compared to the 50° of the Plossls.
    j.gardavsky likes this.
    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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