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Thread: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

  1. #1

    Join Date
    Jun 2019
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    42

    A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    I picked this up at an auction today and I wanted to try to take apart this lens to clean it and try to fix the aperture which is stuck. Not much info is on-line with this lens in particular so I was hoping anyone may have any info and how to proceed.

    The hood was removed with ease and the lens board ring that was attached as well. I think the base seperates even further and the brass part is another ring.

    I also can't get into the front element.

    If I can't do this myself, are there any know repair people that handle old lenses like this?

    Thanks!








  2. #2

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    Jun 2019
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    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Continued:






  3. #3

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    Jan 2009
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    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Need lighter photos of the barrel and the exact engraving!
    Liesegang never wholly commited themselves to mass production of taking lenses and eventually found their niche in projection lens design. But they seem to have kept an eye on their competitor's products and made small runs of similar lenses.

    This could be something between the "Globe" lens and the wide angled RR/Aplanats. It looks a lot like the 1860's/1870's WA series from Gasc et Charconnet.

  4. #4

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    Jun 2019
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    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Quote Originally Posted by Steven Tribe View Post
    Need lighter photos of the barrel and the exact engraving!
    Liesegang never wholly commited themselves to mass production of taking lenses and eventually found their niche in projection lens design. But they seem to have kept an eye on their competitor's products and made small runs of similar lenses.

    This could be something between the "Globe" lens and the wide angled RR/Aplanats. It looks a lot like the 1860's/1870's WA series from Gasc et Charconnet.
    Thanks so much for the response!

    What parts of the barrel for lighter photos? The entire inscription is shown in those images: “No. 12541 Ed. Liesegang Eberhold”

  5. #5

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    Sep 2007
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    AZ
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    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    You are going to have to be an explorer to discover how to get this apart I fear. Everything that was assembled, can be disassembled. The trick it to do it non-destructively. The outside ends next to the glass don't look like the normal brass fittings that unscrew. There is no knurling. Therefore I deduce the glass was inserted from the INSIDE. So that means you may be able to unscrew the barrel, probably where that raised ridge is near the wheel stop. But nobody knows who hasn't taken one apart, and this is not a common lens, so I doubt anyone has in recent generations.

  6. #6

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    Jun 2019
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    42

    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Quote Originally Posted by goamules View Post
    You are going to have to be an explorer to discover how to get this apart I fear. Everything that was assembled, can be disassembled. The trick it to do it non-destructively. The outside ends next to the glass don't look like the normal brass fittings that unscrew. There is no knurling. Therefore I deduce the glass was inserted from the INSIDE. So that means you may be able to unscrew the barrel, probably where that raised ridge is near the wheel stop. But nobody knows who hasn't taken one apart, and this is not a common lens, so I doubt anyone has in recent generations.
    Yeah I figured as much. The issue may be that the pieces are locked up as well. Would using a penetrating oil be outr of the question or too extreme in your opinion?

    And yes there does appear to be a seam by ther raised area below the aperture wheel.

  7. #7

    Join Date
    Jun 2019
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    42

    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Alright after messing around with it, I was able to get the back plate off But at this point it seems the hood and back plate are the only obvious removal bits. I definitely think you are right that the barrel assembly is the main point of entry. These lenses are fairly simplistic correct? Two elements only?

  8. #8

    Join Date
    Jun 2019
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    42

    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    I don't think it will be possible to do it by hand so any recommends for tools to safely grip the two halves and torque?

  9. #9

    Join Date
    Jun 2019
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    42

    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Progress!

    Tried some penetrating oil on the apparent seam in the middle of the barrel. Dabbed it with a toothpick and let it sit for about 5 minutes. Because of the proximity of the aperture wheel it also was unavoidable to get it in there too but figured it couldn't hurt too much and maybe it would oosen it up and lo-and-behold, the aperture wheel is now spinning. So, hoping for the best with the seam and will try to loosen the two halves in a bit with some more sitting. I have two thin strap wrenches but even though they are thin, both won't fit. I may have to try with rubber gloves on instead.

  10. #10

    Join Date
    Jun 2019
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    42

    Re: A bit stuck (literally) on how to proceed taking apart this Liesegang Lens

    Lol, the aperture ring froze up again. Back to drawing board. Needs some more aggresive oiling I think.

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