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Thread: Baader Classic Orthoscopic for lunar

  1. #1
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    Default Baader Classic Orthoscopic for lunar



    To finish off a recent eyepiece binge aimed at upgrading I have paid close attention to the opinions of good folks who have had praise for the BCO EPs. I understand that off axis viewing suffers a good bit as Baader opened up the field to 50 degrees beyond a traditional orthoscopic to aid in finding an object. I'm fine with that as my use would be primarily be for relatively smaller DSOs and planetary. I'm also very interested in using the BCO for lunar. My question is how much the off axis fuzziness will affect lunar viewing. My use will be with scopes between F/5 and F/12(ish). Will it be distracting at the edge of field and degrade significantly from the overall view? My contemplated acquisition is the 10mm.
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  2. #2
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    Default Re: Baader Classic Orthoscopic for lunar

    Never mind. I went with a different EP that satisfies my concerns and more. I'm sure that I will add a BCO down the road a bit.
    "I've... seen things you people wouldn't believe; attack ships on fire off the shoulder of Orion; I've watched C-beams glitter in the dark near the Tannhauser Gate. All those... moments... will be lost... in time, like... tears... in rain."

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    Default Re: Baader Classic Orthoscopic for lunar

    Hello Rogan,

    I am using the BCOs f=6mm and 10mm, and I have not experienced distracting loss of sharpness towards the edge.
    Baader claims to use the new HT Zeiss/Schott glass materials, and that might be also a reason for the widened FOV.
    The views on the Moon craters are extremely crisp, and the f=10mm seems to be quite well corrected when I am experimenting with the Baader 685nm pass-filter, even if this filter requires more light gathering power than my 6".

    Now to the f=6mm: The f=6mm has been also great on the Syrtis Major Planum and on the pole cap on Mars, when using the green filter against the refractor CA. This EP is also great on the globular clusters, if you like them.

    So, on your place, I'd go for the f=6mm.
    However, this EP has no field stop, as there has been no place to put it between the Abbe triplet and the field lens.
    Hence the planet or a Moon crater will fade away after some time, ha, ha, but no problem for me.

    Wishing you the best choice with your arsenal expansion,

    JG
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    Default Re: Baader Classic Orthoscopic for lunar

    Hey JG, thanks much for the info. While I made a different choice for this acquisition when I do get a BCO it will be the 6mm rather than the 10mm. Based on your comments it seems best suited for my uses. Globulars are overall my favorite DSOs.

    For this addition I chose the Meade 5000 8.8mm UWA WP. 82 degrees, edge to edge resolution, and sharp with excellent contrast. There is some EoFB but it has been minimized with the newer WP. My buddy has a set of the UWAs which I have been able to use quite a bit. They have given me some outstanding views. I'm not sure why I hadn't thought of them sooner. Probably because they were outside of what I originally had budgeted. My rational is that the $40 extra for the UWA will soon be forgotten. Like the BCO the UWA is an excellent value.

    I also plan to use the lens from a GSO Barlow in the EP filter threads (for 1.5x) which will give me 5.8mm. I'm not a big fan of putting more glass in the light path but it may pay off.
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    Default Re: Baader Classic Orthoscopic for lunar

    I love my 6mm BCO. Nice and sharp to the edge. Saturn through my vintage ATCO is superb. Lots of detail and color even at that mag. Much better than using a Barlow. Even slightly over my Baader Hyperion zoom 2.25x which has become my go to Barlow all the time now. Keep us posted on how you like the Meade I;m quite interested. I came very close to purchasing that particular one myself. For wide mag I love my 8mm Radian the best.
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    Default Re: Baader Classic Orthoscopic for lunar

    The problem with wide field EPs for lunar observation is that you're going to get some (or a lot) of field curvature. Orthos are flat field. Like JG I have not really noticed any real softness at the edge of the 10mm and I've used the 6mm with my 120ST f/5 frac with great success - they both provide really sharp views. I'm looking forward to trying these both out with my 120ED once I get a suitable bag to travel with it to my site for lunar observation and planetary.
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    Default Re: Baader Classic Orthoscopic for lunar

    I get no apparent field curvature from the 8mm Radian. My favorite eyepiece for 4 years now.
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    Default Re: Baader Classic Orthoscopic for lunar

    Fortunately the 5000 UWA WP is especially noted for it's field flatness. The first generation UWAs suffered from "fishbowling".
    "I've... seen things you people wouldn't believe; attack ships on fire off the shoulder of Orion; I've watched C-beams glitter in the dark near the Tannhauser Gate. All those... moments... will be lost... in time, like... tears... in rain."

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    Default Re: Baader Classic Orthoscopic for lunar

    Quote Originally Posted by Rogan View Post
    To finish off a recent eyepiece binge aimed at upgrading I have paid close attention to the opinions of good folks who have had praise for the BCO EPs. I understand that off axis viewing suffers a good bit as Baader opened up the field to 50 degrees beyond a traditional orthoscopic to aid in finding an object. I'm fine with that as my use would be primarily be for relatively smaller DSOs and planetary. I'm also very interested in using the BCO for lunar. My question is how much the off axis fuzziness will affect lunar viewing. My use will be with scopes between F/5 and F/12(ish). Will it be distracting at the edge of field and degrade significantly from the overall view? My contemplated acquisition is the 10mm.
    Fuzziness, what fuzziness? I can't see any with BCO. But for Lunar I prefer panoramic views and ES 82 degree EPs doing great job for me there.

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    Default Re: Baader Classic Orthoscopic for lunar

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

    I am using the BCOs f=6mm and 10mm, and I have not experienced distracting loss of sharpness towards the edge.
    Baader claims to use the new HT Zeiss/Schott glass materials, and that might be also a reason for the widened FOV.
    The views on the Moon craters are extremely crisp, and the f=10mm seems to be quite well corrected when I am experimenting with the Baader 685nm pass-filter, even if this filter requires more light gathering power than my 6".

    Now to the f=6mm: The f=6mm has been also great on the Syrtis Major Planum and on the pole cap on Mars, when using the green filter against the refractor CA. This EP is also great on the globular clusters, if you like them.

    So, on your place, I'd go for the f=6mm.
    However, this EP has no field stop, as there has been no place to put it between the Abbe triplet and the field lens.
    Hence the planet or a Moon crater will fade away after some time, ha, ha, but no problem for me.

    Wishing you the best choice with your arsenal expansion,

    JG
    Yeah. What he said.
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