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Thread: planetary ortho for nebulas

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    Default planetary ortho for nebulas



    Hi - I see that plenary ortho eyepieces are highly rated in terms of light scatter control, contrast and high transmission.

    I am wondering I don't see anyone using them for lets say nebulas or planetary nebulas if they have high transmission and contrast. I do understand that they have a narrow field of view but how about their use with lets say planetary nebulas ?for example the most premium one I have read about are the ZAO II. Would someone use a zAO II eyepiece on a planetary nebula over a lets say another premium wide field eyepiece ? Wouldn't the ZAO II show more details and contrast ?
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    Default Re: planetary ortho for nebulas

    Many people (including me ) use orthos for DSOs. I never tried ZAO II. But Baader Clasic Orthos I use, outperform on occasion wide field EPs I have (ES 82 and 68 deg, Meade 5000 UWA) on very faint DSOs. Sometimes I can't detect faint galaxy with my wide fields, but managed to resolve it with averted vision using Orthos.
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    Default Re: planetary ortho for nebulas

    A orthoscopic eyepiece can be used for any object you wish to view.
    The Fujiyama-HD is about as close as you will come to the ZOA II in todays market.
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    Default Re: planetary ortho for nebulas

    I love my Fujiyama-HD 18mm. It's a great DSO eyepiece in all of my scopes.
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    Bryan

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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    Default Re: planetary ortho for nebulas

    One comment I will make is the misconception of an Orthoscopic eyepiece having a narrow field of view.
    The term Orthoscopic just means "free of abberations" such as the Zeiss Abbe eyepieces.
    My planetary eyepiece set has AFOV from 30-60° consisting of Abbe, Hastings triplets, Kellner, reversed Kellner, Astroplanak and others.
    They all vary in lens counts from 3 all the way to 8 elements but they are all considered Orthoscopic.
    Last edited by Gabby76; 08-22-2018 at 05:01 AM.
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    Default Re: planetary ortho for nebulas

    oh thats cool ! yea I was under the misconception that those abbe orthoscopic eyepieces are only used for planetary. so far I have only read posts/articles on user judging them based on their planetary performance.

    Couple of weeks ago I was actually observing the cat's eye nebula and it was pretty small with medium magnification. I was surprised how well I could push the magnification but it would get fainter and fainter. So then it clicked my mind " I wonder how an orthoscopic eyepiece would perform on these types of object " . I read that the benefits of them having less glass would give a slight increase in contrast and transmission.

    as a side note, I don't plan on purchasing a ZAO eyepiece, they are super expensive. I just used it as an example of a premium orthoscopic eyepiece.

    My last eyepiece purchase was last year. So I might very well considering to get an ortho eyepiece early next year. I will check out the Fujiyama HD

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    Default Re: planetary ortho for nebulas

    A good planetary eyepiece will give you excellent contrast and detail but is also useful for studying detail in nebula.
    The Fujiyama-HD are an excellent eyepiece as well as the Baader Classic Orthos.
    You can find some of the older ones used such as the University Optics, Meade Research Grade, Baader Genuine Ortho or Astrohutech for a reasonable price.
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    Default Re: planetary ortho for nebulas

    The ZAOI and ZAOII eyepieces are highly regarded because of their very high internal resolution.

    The Abbe orthos are in general an excellent choice for the DSOs, and the BCOs, KK Fujiyamas, and the Baader Genuine Orthos don't break the bank.

    When you want even more transmissivity with a very high contrast at f=25mm, then the discontinued Carl Zeiss West E-Pl 10x/20 #444231, and the Leica HC Plan 10x/20#507802, are higher regarded for the DSOs than the ZAOs.
    When you want even more contrast at the highest technically achievable transmissivity, and when the costs don't play a role, then the Leica HC Plan S 10x/22 #507807 is the way to go.

    At the shorter focus lengths down to 11mm, the intrafocal Leica B series for the the Leica Televid spotting scopes, offers a brutal contrast at still very high transmissivities, which are comparable or better than the Abbe orthos (BCO, Takahashi). Not behind the Leica B are the Zeiss eyepieces for the Diascope spotters. It is all a matter of personal preferences, and of what ypour own eye can see or not through the eyepiece.

    So, whenever you will try to beat the discontinued and the still produced Abbe orthos on the transmissivity and contrast, you will pay three times, or four times, or even more money.

    Best,

    JG
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    Default Re: planetary ortho for nebulas

    I am a bit confused. Are these microscope eyepieces that can be used in a telescope ?

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    Default Re: planetary ortho for nebulas

    Also at F = 25mm , did you mean Carl Zeiss E-PL 10x25 instead of Carl Zeiss West E-Pl 10x/20 ?

 

 
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