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Thread: Nice 25mm Carl Zeiss Jena eyepieces.

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    Default Nice 25mm Carl Zeiss Jena eyepieces.



    CZJ 25 mm

    Recently I bought these: https://www.ebay.de/itm/291338904674...&hlpv=1&cond=1
    They costed 29 euro's a piece, roughly one twelfth of a Panoptic and one third of a KK Fujiyama. It is a symmetrical Plössl, f 25mm, military grade polished, amber colored somewhat older (?) coatings on all four air- glass surfaces. I distinguished 3 different amber colors. And a field of 40 degrees. They came in a small plastic bag each, no caps and no markings on the outside. Matt black, inside well blackened and provided by what I call a small "darkroom" between the first field stop and field lens. That is an effective light trap. Well machined out of one piece. The lenses are held in place by black rings. No unpleasant surprises.

    To give the 25mm eyepiece a wider range I tested it with and without a 2.5X Powermate. With this barlow it acts as having an F of 10mm. As a reference I used a high-end 24mm Panoptic and in some cases an unbarlowed 9mm KK Fujiyama. (startesting and M37)

    First view on Wirtanen, M42, Pleiades and M37 in my f/7.5 refractor seemed all right. I suspected some astigmatism at first sight, since the CZJ was already in the f/7.5 refractor as I set it up. Wrong Sir! Astigmatism always appears in a telescope system while cooling down. If not only as a result of the cooling lens, astigmatism as a result of a cooling diagonal mirror occurs too. Sital made mirror or not, a jump of 27 degrees Celsius is a big jump. When in equilibrium some curvature of field and astigmatism at the field stop was still there and diminished when barlowed with my 2.5X Powermate. Edge-astigmatism disappeared with the 24mm Panoptic.

    Seeing was good and I saw a well-defined in and out focus image of Aldebaran, the sort of thing one can really enjoy. No false reflections or ghost-images, it was a crystal clear image of Aldebaran. Only outperformed by the 9mm KK. The coatings were effective enough to show the faintest stars that surround Aldebaran, though I needed a bit more averted viewing for the faintest ones I saw compared with the 24 mm Panoptic. That difference was more or less gone when I barlowed both.

    Light scatter was low, lower than the 24mm Panoptic;a bit smaller, but above all fainter.(polishing!) The dark split between two close double stars seemed a bit darker. When barlowed things were somewhat more obvious. Scattering was on par or even lower than the 9 mm KK Fujiyama.

    Impressions of Comet Wirtanen were nice although I preferred the wider view in the Pan with the surrounding dark space. The bigger area of dark field that surrounds an object seems to work as an contrast enhancing factor. At least that is the case in my eyes. When turning to M42, which is already rather extended, the effect is less. That was the case here too. The slightly brighter impression Wirtanen gave me in the Panoptic, was gone on M42. Was I wrong, or did I see slightly sharper defined blobs and swirls in M42? (This is the pitfall called: “The new one must be better”) Yes, it was the pitfall... When barlowed the E-star in the Trapezium stood out a fraction better. And that was no pitfall, but an observation, thanks to the slightly fainter scattering in the CZJ. F- star was on the edge of autosuggestion, in both barlowed eyepieces.

    Turning to M45 gave another pleasant surprise. Our good friend and expert JG advised me to use a Baader CCD-B filter in order to have at least a chance on detecting some nebulosity around the main stars of the Pleiades. So I used one. Both eyepieces showed no nebulosity what-so-ever without the filter. Both eyepieces showed a hint of scattered light around the brightest stars and a darker area in the middle of the cluster. Edges of the cluster were somewhat brighter. Scattering or bad filter perhaps? No, outside M45 and on other bright stars nothing of the sort was shown at all. Did I see other differences apart from the field of view? No I didn’t.
    BTW. The filter gives a nice blue and white show on bright stars: when seen with averted vision a bright star seems white. Direct vision gives a blue star! Has to do with the enhanced sensitivity for color in the center of the human retina.

    On M37 all views were quite pleasant, the barlowed ones more so than the unbarlowed ones, because of the darker background. Sorry to say, but the sweet spot with this refractor under these skies was hit by the 9mm Fujiyama. Nevertheless stars were pinpoint like and stood out in sharp definition. In both eyepieces.

    Everything taken into consideration the twelve times cheaper 25mm CZJ is well on par with the 24mm Pan. If one doesn’t care for the wider field or pinpoint stars on the very edge of the field in a f/7.5, the CZJ is a good and much cheaper alternative. Barlowed the cards are even better. Its capability of showing faint stars in an area with nebulosity like the Trapezium impressed me.

    I will use this eyepiece as an alternative to the 24mm Panoptic, since that one sits standard in my Maksutov. I don’t mind much the smaller field of view. M45 does fit in at 36X though. The wider field of the Panoptic however has its advantages when searching for a comet for instance. More obvious is its barlowed use as a 10 mm eyepiece on several DSO's. It is remarkable how this cheap quality eyepiece holds its own against the high end 24 mm Panoptic. Quite different from the 25mm-ers that come standard with a new telescope.

    Thanks for the suggestion JG!

    Thanks for reading this all the way down:-)
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    Default Re: Nice 25mm Carl Zeiss Jena eyepieces.

    Hello John,

    thank you very much for the precise shootout of the Zeiss (CZJ) military Plössl.
    Yes, it is a very nice eyepiece, and a valuable alternative to the much more expensive Tele Vue Plössl,
    when people are looking for f=25mm.
    The 40° AFOV cuts away the peripheral vision, and it allows me to concentrate more on the details in the nebulae.

    Just a comment on the Pleiades.
    The interior of this cluster looks to me black, the surroundings are visibly bright, probably due to the gas and dust blown away by the bright stars.
    This is what a high grade EP should reveal.


    Clear skies,

    JG
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    Default Re: Nice 25mm Carl Zeiss Jena eyepieces.

    Excellent review John, thanks for sharing your thoughts on these eyepieces.
    Sounds like a good alternative to the high end expensive eyepieces.
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    Default Re: Nice 25mm Carl Zeiss Jena eyepieces.

    This is a fine review John, with very useful observational data shared.
    Thank you.

    I may need to look for this one for my collection. :-)
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    Default Re: Nice 25mm Carl Zeiss Jena eyepieces.

    Nice review John! I am always looking for good double splitting EPs. Just checked the link and the don't ship to US.

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    Default Re: Nice 25mm Carl Zeiss Jena eyepieces.

    Quote Originally Posted by Bigzmey View Post
    Nice review John! I am always looking for good double splitting EPs. Just checked the link and the don't ship to US.
    The best way is to contact Mrs. Langner-Voss at BW Optik,

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    Best,

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    Default Re: Nice 25mm Carl Zeiss Jena eyepieces.

    Thanks to all for your kind reactions.

    Quote Originally Posted by j.gardavsky View Post
    Hello John,
    (...)
    Just a comment on the Pleiades.
    The interior of this cluster looks to me black, the surroundings are visibly bright, probably due to the gas and dust blown away by the bright stars.
    This is what a high grade EP should reveal.


    Clear skies,

    JG
    Like I saw it, thanks for confirming through your own observations!
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