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Thread: 42mm Orion lanthanum EP use?

  1. #11
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    Default Re: 42mm Orion lanthanum EP use?



    Quote Originally Posted by jerryTheC View Post
    Just a reminder - although the form factor of the Vixen LVWs, Baader Hyperions, and some of the Orion eyepieces (stratus? - not sure) are very similar, the optics are DIFFERENT - this isn't a case where the same eyepieces are sold under different brands.
    In this case it is the case! . This particular Orion lanthanum series was made by Vixen for Orion.
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  2. #12
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    Default Re: 42mm Orion lanthanum EP use?

    I have a 22mm version of this eyepiece it's really good wish I could get this 42 for my Bosma Mak especially at that price
    Richard
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    Default Re: 42mm Orion lanthanum EP use?

    Quote Originally Posted by 12richardk View Post
    I have a 22mm version of this eyepiece it's really good wish I could get this 42 for my Bosma Mak especially at that price
    Vixen still makes them though they are spendy at about $380 US, but well worth it. Don't know where you would get one in your neck of the woods though.
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    Default Re: 42mm Orion lanthanum EP use?

    Quote Originally Posted by BrokeStarGazer View Post
    Club has a 42mm Orion 2" Lanthanum EP for sale for $40. Seems like a good deal. Scope is 1200mm though so that would only get me 28x.....smallest I have now is 25mm. Question is....Is there a use at 28x and what might those be?? Mostly hunt DSO but never know might venture out.
    BSG
    Did you ever pick up this EP and if you did what are your experiences with it?
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    Default Re: 42mm Orion lanthanum EP use?

    Exit Pupil, that's a Red Herring if ever there was one. has very little application in the real world. I use outlandish long focal length eyepieces with good results in all my scopes. Great for comets and big clusters. Russell Optics on ebay sells an 85mm one. I have 65,56,45mm ones to get lowest powers and big chunks of sky without resorting to impossibly expensive wide fields like Naglers and their ilk. Doesn't seem to matter if the scopes exit pupil is bigger than your eyeball, you are still seeing large stuff very well indeed.
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    Newtman but some refractors allowed.

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    Default Re: 42mm Orion lanthanum EP use?

    Exit pupil is no "red herring" at all. It's a better guide to contrast discernment effects on DSOs than magnification. With a refractor you can get away with large exit pupils but you're effectively stopping down the scope. If your eye accommodates a 6mm exit pupil and you use a 10mm exit pupil eyepiece you've just stopped down your aperture to 60%. On obstructed telescopes you start seeing the central obstruction which many find unpleasant.

    If you've seen a DSO in a larger scope and want to try for it in a smaller one exit pupil is a much better guide than magnification.

    So exit pupils very useful if you know how to use it. Those Russell long focus eyepieces are OK in a refractor and a slow Mak but on a Newt? If you like looking at an illuminated doughnut with a dark central hole, maybe.

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    Default Re: 42mm Orion lanthanum EP use?

    Here is a paper form Al Nagler on choosing EPs. Exit pupil is an impotent parameter to consider, however in refractors you could still use extra low power, albeit loosing some aperture as nFA indicated

    Tele Vue Optics: Choosing Your Telescope's Magnification

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    Default Re: 42mm Orion lanthanum EP use?

    Quote Originally Posted by Bigzmey View Post
    Here is a paper form Al Nagler on choosing EPs. Exit pupil is an impotent parameter to consider, however in refractors you could still use extra low power, albeit loosing some aperture as nFA indicated

    Tele Vue Optics: Choosing Your Telescope's Magnification
    I think you meant "important" not "impotent". I think an impotent eyepiece would be one with a magnification of 1, much like the eyepieces supplied with TP rolls.

  11. #19
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    Default Re: 42mm Orion lanthanum EP use?

    Quote Originally Posted by not_Fritz_Argelander View Post
    I think you meant "important" not "impotent". I think an impotent eyepiece would be one with a magnification of 1, much like the eyepieces supplied with TP rolls.
    "Important" - "impotent", "tometoes" - "tomatoes"

 

 
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