Durst Lapla 39 problem

Discussion in 'Darkroom Equipment' started by gliderbee, Apr 15, 2013.

  1. gliderbee

    gliderbee Member

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    I have a Durst Lapla 39 that is meant (obviously) for 39mm thread lenses.

    Please have a look at the picture.

    2013-04-15 21.25.09.jpg

    It does seem to have a center part, that looks to me like a thread reducer that might be removable in order to use lenses with a larger diameter. Is that correct ? I did not succeed in removing it. Is there a trick ? Is it a left or right-handed thread ? Or is it not removable at all ?

    Thanks,
    Stefan.
     
  2. BMbikerider

    BMbikerider Member

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    I don't think so. If I remember correctly the main carrier for the threaded portion are all the same and in this case the centre 39mm threaded part is a press fit. There would be another smaller press fitted part for 25mm thread lenses. It is all about making them cheaper to produce. The large part being common and the smaller part with the thread made to fit.
     
  3. ac12

    ac12 Member

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    Stefan
    That looks like it might be a 39 to 25mm reducing adapter.
    Durst had those adapters to use the 25mm Schneider thread lenses in the 39mm LAPLA lens panels. The adapter avoided them having to make various 25mm lens panels. They make 39mm lens panels and those that want to use the 25mm lens just get the reducing adapter. It should unscrew from the LAPLA. HOWEVER, the question is does it unscrew up or down. From the pix, it is hard to tell if there is a flange on the top of the adapter. If there is a flange, then you would unscrew it UP (towards the camera in the pix). The trick is to use a tool to push against the small ridges and not damage the ridges. Unless you don't need the adapter, then damaging it won't matter.
     
  4. gliderbee

    gliderbee Member

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    Those ridges are very easily damaged, but I don't really need the adapter.

    Here's a picture that might tell you more:

    2013-04-16 21.07.22.jpg

    What do you think: when looking to the ridges-side, should I turn clockwise or anti-clockwise ?

    Thanks,
    Stefan.
     
  5. darkprints

    darkprints Member

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    The LAPLA is made for a 39mm threaded lens. Therefore, the adapter is threaded into the LAPLA the same as a lens.
     
  6. gliderbee

    gliderbee Member

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    That sounds logical. I'll try clockwise then and report back.

    Thanks,
    Stefan

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  7. ac12

    ac12 Member

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    I think the flange is on the bottom, the side opposite the ridges.
    So looking at the bottom, I would use a large arc-joint plier (or similar) and grab the outside of the black adapter from the bottom and turn the plier counter-clockwise while holding the lapla still.

    Too bad they did not make it easily removable.
     
  8. gliderbee

    gliderbee Member

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    OK! This logic worked! With some pliers and a bit of force, it's out, and the insert can still be used :smile:.

    Thanks all for your help.

    Stefan

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