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Thread: Opening front group of a Wollensak 190mm enlarging lens?

  1. #1
    Do or do not. There is no try.
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    Opening front group of a Wollensak 190mm enlarging lens?

    I just picked up one of these that has slight fungus in the front group. It looks like the front group may unscrew from the barrel but it doesn't, at least with the force I can apply by hand. The front trim ring (with the lettering) looks to be threaded but it didn't give with my hollowed-out rubber stopper. I haven't tried seeping acetone into the threads yet.

    Has anyone ever been inside one of these? Is removing the trim ring the right way in? I'd really like to clean it up as the coatings are really nice, it would be a good lens for the 5x7 conversion I'm planning for my Beseler 45.

  2. #2

    Join Date
    Mar 2017
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    Del City, OK
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    Re: Opening front group of a Wollensak 190mm enlarging lens?

    It’s probably glued shut. I’ve had a few old lenses that were. Try painting the ring with naphtha and letting it soak in a bit.

    Acetone would probably work, but it will likely eat the paint. I’d save that for desperate measures.

  3. #3
    Do or do not. There is no try.
    Join Date
    Jan 2007
    Location
    Massachusetts, USA
    Posts
    778

    Re: Opening front group of a Wollensak 190mm enlarging lens?

    Thanks for the reminder about naphtha/Ronsonol. I’ll definitely trybthat first, and will test carefully before trying acetone or ethyl acetate.

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