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Thread: 9mm Williams Optics SWAN Disassembly

  1. #11
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    Default Re: 9mm Williams Optics SWAN Disassembly



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  2. #12
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    Default Re: 9mm Williams Optics SWAN Disassembly

    Quote Originally Posted by Shorty Barlow View Post
    Attachment 172664

    I originally bought these as a bino pair.
    There are five lenses in four groups.
    An asymmetrical convex eye lens, a doublet, a concave undersided convex lens and a concave field lens with a flat upper surface.
    It's strange, I agree.

    I can buy in an asymmetrical convex eye lens sitting over a doublet.
    But the other lenses,
    did they want to make a sort of air-spaced "field Barlow" in front of the doublet?

    Thanks for the dissection,

    JG
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  3. #13
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    Default Re: 9mm Williams Optics SWAN Disassembly

    Quote Originally Posted by j.gardavsky View Post
    It's strange, I agree.

    I can buy in an asymmetrical convex eye lens sitting over a doublet.
    But the other lenses,
    did they want to make a sort of air-spaced "field Barlow" in front of the doublet?

    Thanks for the dissection,

    JG
    That's the only thing that makes sense of this layout. The only reasons I can think of to do it this way are 1) novelty for the sake of novelty or 2) they needed the additional degrees of freedom from additional surfaces to control some aberrations and didn't care about the design penalties of those surfaces.

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    Default Re: 9mm Williams Optics SWAN Disassembly

    Quote Originally Posted by j.gardavsky View Post
    It's strange, I agree.

    I can buy in an asymmetrical convex eye lens sitting over a doublet.
    But the other lenses,
    did they want to make a sort of air-spaced "field Barlow" in front of the doublet?

    Thanks for the dissection,

    JG
    It's definitely weird. Maybe it was designed for a bet? lol
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    Default Re: 9mm Williams Optics SWAN Disassembly

    Sounds like another modified Konig to me. Are there any advertised Erfles out there, which are actually Erfles?

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    Default Re: 9mm Williams Optics SWAN Disassembly

    Quote Originally Posted by Bigzmey View Post
    Sounds like another modified Konig to me. Are there any advertised Erfles out there, which are actually Erfles?
    Definitely not Konig. The airspace doublet of negative lenses makes it really really non Konig.
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    Default Re: 9mm Williams Optics SWAN Disassembly

    Quote Originally Posted by j.gardavsky View Post
    It's strange, I agree.

    I can buy in an asymmetrical convex eye lens sitting over a doublet.
    But the other lenses,
    did they want to make a sort of air-spaced "field Barlow" in front of the doublet?

    Thanks for the dissection,

    JG
    The way I see it they took your typical 1-2-1 Konig with 55 deg and added extra element to widen the FOV.

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    Default Re: 9mm Williams Optics SWAN Disassembly

    Quote Originally Posted by Bigzmey View Post
    The way I see it they took your typical 1-2-1 Konig with 55 deg and added extra element to widen the FOV.
    1) The asymmetrically convex eye lens rules out it being having anything to do with a typical 1-2-1 Konig I. The eyelens of a Konig I and Konig II is more of a meniscus.
    2) The addition of a negative field element or elements is generally regarded as drastically changing the design of the eyepiece. It's more like an attempt at an extremely cheap Nagler than anything Konig.
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    Default Re: 9mm Williams Optics SWAN Disassembly

    Re Lenses grouping as found by Shorty Barlow:
    An asymmetrical convex eye lens, a doublet, a concave undersided convex lens and a concave field lens with a flat upper surface.

    Hello not_Fritz,

    a sort of "minimalized stripped-off Nagler" I agree and it sounds likely, when the concave/flat field lens would "stand" for a sort of stripped-off "Smyth", and the concave undersided convex lens would be a correting element - something like a "low power meniscus", but a "low power meniscus" is not a meniscus on my list, ha, ha.
    Don't have enough "" "" on my keyboard, sorry.
    The wave fronts must go pretty weird in this design, I bet.

    Thanks,

    JG
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    Default Re: 9mm Williams Optics SWAN Disassembly

    I think that the design is a nightmare. Konig is a perfectly good design in and of itself.

    My guess is that all those extra surfaces in Nagler designs are done with a view toward tolerances that make the wave fronts pretty reliable in manufacturing. This stripped down Nagler could only work if everything was perfect. The chances of that happening in a manufacturing process are vanishingly small....
    Last edited by not_Fritz_Argelander; 02-12-2018 at 02:44 PM.

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