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Thread: Orthoscopic Eyepiece

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    Default Orthoscopic Eyepiece



    Well I am still ordering eyepieces. Now I am thinking of ordering an Orthoscopic or 2. Probably 18mm and a 9mm or 10mm. I am looking at the Baader Classic Orthoscopic, UO H.D. Orthoscopics, Kokusai Kohki Fujiyama HD-OR Orthoscopic, or the Edmund Optics Orthoscopic Eyepieces. I have never used an Ortho and want to give them a go. Besides I believe its better to have to many tools in the shed then not not the right one for the job. Opinions are indeed being solicited from those with experience using Orthoscopics. I would want to use them in both of my 8" and 6" scopes on the Moon and what ever else they would be good for.
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    Default Re: Orthoscopic Eyepiece

    I don't think you can go wrong with any of the companies mentioned here. I love my Baader BCO. Orthos are not for everyone with the short eye relief but when I'm by myself with the scope I find they are preferred and really give amazing views.
    Last edited by Leveye; 12-15-2016 at 05:38 AM.
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    Default Re: Orthoscopic Eyepiece

    The UO and Fujiyama are the same eyepiece. UO just rebrands them.
    The Fujiyama and BCO are all excellent eyepieces but the Baader have a wider field of view. BCO 50* & Fuji 42* AFOV. Depending on the type of object you are viewing you may not notice much of a difference between the 2 while viewing though.
    I have not tried the Edmunds Orthoscopics but the numbers for them are almost the same as the Fujiyamas.
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    Default Re: Orthoscopic Eyepiece

    I love my orthos, and my vote here would be for the UO or Fuji, get whichever is cheapest the day you order. I can vouch that the 18 and 10mm BCO's were pretty good, but I had less than good experience with the 6mm where others have good 6mm BCO's. Still, if you can afford the little bit extra, get the UO/Fuji, you won't regret it.
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    Default Re: Orthoscopic Eyepiece

    Hello Geoferryt,

    a 10mm ortho, that has a still comfortable eye relief, would be a very good start. You can barlow-up the magnification without loosing the eye relief.
    I am very happy with the BCO 10mm. The BCO Barlow offers two magnification factors - 2.25x and 1.3x, but still not tested the performance with the BCO Barlow on the Moon. The 50° useable field of view of the BCO orthos offers also more comfort than the 40° of the other orthos.

    Best,

    JG
    Last edited by j.gardavsky; 12-15-2016 at 03:51 PM. Reason: something has been missing
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    Default Re: Orthoscopic Eyepiece

    Aren't orthoscopic eyepieces better suited to refractors? Although, having said that I've used my 10mm BCO on a few occasions for its higher performance to see to very faint galaxies with my 8" SCT at f/6.3 when other eyepieces have failed. I don't know what would give a better performance though for the Moon and planets with a reflector - I would have gone with the high end Plossl.
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    Default Re: Orthoscopic Eyepiece

    Thanks Dave,

    a good Plössl would be also the way to go, but I am somehow more inclined towards the Abbe's "triplet loupe + eye lens' design, than towards the double achromatic Plössl, even if my Tele Vue Plössls are very good performers.

    Best,

    JG
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    Default Re: Orthoscopic Eyepiece

    I don't believe Orthos care which scope they're used in. Alvin Huey is known to use orthos in his big dobs. I've used them in dobs before very successfully. If there's anything that might be claimed it would probably be orthos work best in a driven scope, but if your bearing actions are smooth accurate enough the ortho would work well.

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    Default Re: Orthoscopic Eyepiece

    Quote Originally Posted by stargazer769 View Post
    I don't believe Orthos care which scope they're used in. Alvin Huey is known to use orthos in his big dobs. I've used them in dobs before very successfully. If there's anything that might be claimed it would probably be orthos work best in a driven scope, but if your bearing actions are smooth accurate enough the ortho would work well.
    Yes, exactly. The only time I really have 'motor envy' is when I'm hunkered over my UO Abbe Ortho looking at a hard-to-find DSO at the highest magnification. Bumping works OK until I make a mistake, and then the hunt begins again. Often that means putting in a wider eyepiece to re-orient. At extremes of magnification, objects zip through the field within 20 seconds or so, which isn't quite enough time to allow vibration to settle and meaningful viewing to happen. Viewing through any glass becomes exponentially more difficult at the highest magnification, and the shallow eye relief and narrow AFOV of simple planetary eyepieces doesn't make it any easier.
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    Default Re: Orthoscopic Eyepiece

    my 6" Orion is on a mount with a motor, I don't have the motor controller hooked up at the moment, but I could hook it up if needed. I have been looking at getting a refractor later. If I do I may also purchase a good eq mount with drive for it to ride on.
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