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Thread: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

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    Default Plössl f=25mm: Carl Zeiss Jena against Tele Vue



    Hello all,

    the Carl Zeiss Jena (VEB) Plössl eyepiece has been designed about 27 to 30 years ago for the military optics. A small number of items from the manufactured series came on the market tanks to the BW Optik.

    Now, it is interesting to compare the CZJ Plössl designed according to the military grade requirements with the Tele Vue Plössl for the hobby astronomers, as the Tele Vue Plössl has been often regarded as the reference eyepiece among the Plössls,

    CZJ and Tele Vue Plössls.jpg

    the CZJ Plössl is at left, and the Tele Vue Plössls is at right in the above picture.

    As communicated by Mrs. Langner-Voss (BW Optik), the Carl Zeiss Jena (VEB) Plössls come from the army surplus, with the following technical data:
    Tube diameter: 1.25”
    Field stop diameter: 16.3mm (ca 40° AFOV)
    Eye relief: 20mm
    2 cemented doublets, drawing of the optics scheme available from BW Optik
    Fully multicoated
    Correction against the spherical and chromatic aberrations, nearly orthoscopic within 40° AFOV
    Suited for the F/5 telescopes

    So, you can imagine, how curious I have been.

    The tubes are made from anodized light-weight aluminium; a protecting armour and eyeguards are not included. There is no manufacturer’s engraved sign(s) on the tubes.
    The BW Optik offers both the completed pairs of the eyepieces, single eyepieces, and the lens kits to assemble the eyepieces.

    Comparing the f=25mm CZJ and TV Plössls hands on and eyes on:
    Weight: CZJ 68.1g, TV 112.4g
    Length: CZJ 56.5mm, TV 61mm
    Tube diameter in: CZJ 1.25”, TV 1.25”
    Maximum outer diameter: CZJ 34mm, TV 36mm

    Optics scheme: CZJ and TV (field stop – negative/positive – positive/negative), cemented doublets
    CZJ: lens surface curvature convex out, TV: lens surface curvature concave out

    Multocoatings: CZJ: amber-yellow-violet as typical for the T and T* Zeiss multicoatings,
    TV: green-blue-violet
    Internal blackening: CZJ anodized, TV rough blackened surfaces
    Lens rims: CZJ not blackened, TV not blackened
    Transmissivity check when holding the eyepieces against the day light skies: CZJ and TV comparable

    Green laser beam test:
    CZJ: scattering on the laser beam trace very faint on the flint, practically not visible on the crown, impact spot on the air/multicoatings/glass interface small
    TV: scattering on the laser beam trace is bright both on the flint and crown, impact spot on the air/multicoatings/glass interface small

    Test on the 6” F/5 Synta (Sky-Watcher) achromatic refractor
    Tested scene: Houses about 1km away down in the valley, outside temperature 6°C, faint morning sunshine, no significant atmospheric turbulence. Tested visually and with the Lumix GF7 camera.

    The both eyepieces offer at the magnification of 30x amazing views with well resolved details at a high contrast,

    Plössl CZJ vs TV.jpg

    A closer look with repeated observations reveals through the CZJ Plössl a higher contrast and finest details resolved,

    Plössl CZJ vs TV detail .jpg

    The chromatic aberration is better suppressed through the CZJ Plössl, the TV Plössl shows a wider yellow fringe.
    The edge of the FOV performance is very good up to 40° through the both eyepieces.
    Vignetting: CZJ Plössl not visible and not photograpohically recorded, TV Plössl hardly visible, but recorded with the camera.

    Tests on the astronomy objects will be made as soon as the weather permits.

    Thanks for reading, and 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: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Nice find! Congratulations.
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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Just banging the "thanks" button didn't seem a sufficient gesture, so I'm adding a few words here to be sure that you know how much I appreciate your test reports. I have also been encouraged by you to begin exploring the military and medical surplus sources to discover some excellent optics. They are obsolete with digital imaging taking over in those fields, so we are the beneficiaries of an ample supply of excellent performing eyepieces and it appears that the amateur astronomers have not yet effected the prices as much here as in Germany. Condition is the only issue, as most of the "bargain" medical surplus Periplan GF's that I have found have had some cleaning marks on the optical surfaces. I found a few good ones, and I will up date you on the other posting when I have had a chance to use them. Thanks again for this post.

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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Thanks Ken!

    A Plössl designed and made by Carl Zeiss in Jena sounds like an 'outlier', so you can imagine my curiosity.
    Lots of the military optics, like the 10x80 flak robust binoculars mountable on an anti aircraft gun, have been designed and manufactured with the Erfle Eps by the Rathenow Optics. Rathenow is more famous for the opera glasses, though.
    Now, I am curious if the Bundeswehr will toss on the market some big military Carl Zeiss Jena telescopes (?).

    Some surplus military EPs emerge also from Wild Switzerland, well, there are so many nice optics to have.

    Best,

    JG
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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Some of the eyepieces that pre-date the 1989 Leica/Leitz take over, labelled "Wild Heerbrugg AG", are found here in the medical equipment surplus market. Have you tried any of them in astronomic use?

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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Quote Originally Posted by Trombatissimo View Post
    Some of the eyepieces that pre-date the 1989 Leica/Leitz take over, labelled "Wild Heerbrugg AG", are found here in the medical equipment surplus market. Have you tried any of them in astronomic use?
    Hello Ken,

    not yet, but I have my eyes on the eBay, like these https://www.ebay.at/itm/Wild-Mikrosk...IAAOSw-wJaAiH9
    they already have the modern multicoatings like T*

    I will report on the Leica HC Plan S, recently acquired. The terrestrial test of today early afternoon has blown me off the socks, so I'll need first a drink before reporting,

    JG
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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Hello all,

    for anyone interested, there are still 5 pairs of these CZJ Plössls available from B W Optik,
    https://www.ebay.de/itm/2-Stuck-Symm...YAAOSwnDxUoEJE

    Best,

    JG
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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Quote Originally Posted by j.gardavsky View Post
    Hello all,

    for anyone interested, there are still 5 pairs of these CZJ Plössls available from B W Optik,
    https://www.ebay.de/itm/2-Stuck-Symm...YAAOSwnDxUoEJE

    Best,

    JG
    I see they are not shipping to the US unfortunately.
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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Quote Originally Posted by j.gardavsky View Post
    Hello all,

    the Carl Zeiss Jena (VEB) Plössl eyepiece has been designed about 27 to 30 years ago for the military optics. A small number of items from the manufactured series came on the market tanks to the BW Optik.

    Now, it is interesting to compare the CZJ Plössl designed according to the military grade requirements with the Tele Vue Plössl for the hobby astronomers, as the Tele Vue Plössl has been often regarded as the reference eyepiece among the Plössls,

    CZJ and Tele Vue Plössls.jpg

    the CZJ Plössl is at left, and the Tele Vue Plössls is at right in the above picture.

    As communicated by Mrs. Langner-Voss (BW Optik), the Carl Zeiss Jena (VEB) Plössls come from the army surplus, with the following technical data:
    Tube diameter: 1.25”
    Field stop diameter: 16.3mm (ca 40° AFOV)
    Eye relief: 20mm
    2 cemented doublets, drawing of the optics scheme available from BW Optik
    Fully multicoated
    Correction against the spherical and chromatic aberrations, nearly orthoscopic within 40° AFOV
    Suited for the F/5 telescopes

    So, you can imagine, how curious I have been.

    The tubes are made from anodized light-weight aluminium; a protecting armour and eyeguards are not included. There is no manufacturer’s engraved sign(s) on the tubes.
    The BW Optik offers both the completed pairs of the eyepieces, single eyepieces, and the lens kits to assemble the eyepieces.

    Comparing the f=25mm CZJ and TV Plössls hands on and eyes on:
    Weight: CZJ 68.1g, TV 112.4g
    Length: CZJ 56.5mm, TV 61mm
    Tube diameter in: CZJ 1.25”, TV 1.25”
    Maximum outer diameter: CZJ 34mm, TV 36mm

    Optics scheme: CZJ and TV (field stop – negative/positive – positive/negative), cemented doublets
    CZJ: lens surface curvature convex out, TV: lens surface curvature concave out

    Multocoatings: CZJ: amber-yellow-violet as typical for the T and T* Zeiss multicoatings,
    TV: green-blue-violet
    Internal blackening: CZJ anodized, TV rough blackened surfaces
    Lens rims: CZJ not blackened, TV not blackened
    Transmissivity check when holding the eyepieces against the day light skies: CZJ and TV comparable

    Green laser beam test:
    CZJ: scattering on the laser beam trace very faint on the flint, practically not visible on the crown, impact spot on the air/multicoatings/glass interface small
    TV: scattering on the laser beam trace is bright both on the flint and crown, impact spot on the air/multicoatings/glass interface small

    Test on the 6” F/5 Synta (Sky-Watcher) achromatic refractor
    Tested scene: Houses about 1km away down in the valley, outside temperature 6°C, faint morning sunshine, no significant atmospheric turbulence. Tested visually and with the Lumix GF7 camera.

    The both eyepieces offer at the magnification of 30x amazing views with well resolved details at a high contrast,

    Plössl CZJ vs TV.jpg

    A closer look with repeated observations reveals through the CZJ Plössl a higher contrast and finest details resolved,

    Plössl CZJ vs TV detail .jpg

    The chromatic aberration is better suppressed through the CZJ Plössl, the TV Plössl shows a wider yellow fringe.
    The edge of the FOV performance is very good up to 40° through the both eyepieces.
    Vignetting: CZJ Plössl not visible and not photograpohically recorded, TV Plössl hardly visible, but recorded with the camera.

    Tests on the astronomy objects will be made as soon as the weather permits.

    Thanks for reading, and stay tuned,

    JG
    I think my eyes are not as well trained yet...because I don't see it in the Photos or maybe I am biased. The color saturation and contrast of the two TV photos are much better, what I can not see enough of is the wider FOV : with a 55 vs 40 AFOV it should show more !?
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    Default Re: Plössl f=25mm: Carl Zeiss Jena against Tele Vue

    Since some weeks I have those CZJ plössls too. Although my testing of them was not as comprehensive as JG, I second JG in his findings. The laser beam test was an eye-opener compared with other eyepieces ( some of them high-end). Scratch and dig factor of the CZJ is very low. https://www.edmundoptics.com/resourc...pecifications/
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