fungus in apo rodagon

Discussion in 'Darkroom Developing and Printing' started by JCJeski, Dec 6, 2003.

  1. JCJeski

    JCJeski Guest


    I recently purchased a used Apo-Rodagon 80mm. When I looked in the glass,
    there is a fungal mycelium along the outer edge of one of the inner elements.
    This fungus occupies less than 5% of the surface area of the inner element of
    the involved lens. The 5% or less area covered is not densely covered with the
    fungus, because it is strand-like (mycelium). The lens is no longer under

    I paid $300 for the lens. Should I:

    1) send it back for a refund?
    2) be glad that I have an apo for about 1/2 the cost of a new one, and forget
    the fungus?
    3) just get a non-apo rodagon on ebay and send the apo back?
    4) other ideas?


    JCJeski, Dec 6, 2003
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  2. JCJeski

    Mark A Guest

    HP Marketing offers a lifetime warranty for Rodenstock products purchased
    from them (the official US distributor). I don't know it that applies to
    only the original owner or if it covers fungus.

    I would send it back if you can get a refund.
    Mark A, Dec 6, 2003
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  3. JCJeski

    Bob Salomon Guest

    The warranty, in the U.S., on lenses sold by Hp Marketing authorized
    Rodenstock dealers warranties the lens against manufacturing defects for
    the original purchasor's lifetime. The warranty is not transferable and
    does not apply to lenses sold in the gray market or by Calumet (they
    have their own warranty).

    That said there is also the question of exactly which lens you purchased.

    Did you buy the currently manufactured 80mm Apo Rodagon-N or the older
    80mm Apo Rodagon? They are quite different lenses.

    We would not recommend anyone purchase a lens that exhibits any optical
    problem such as fungal growth, seperation, etc or obvious mechanical
    problems like dents, crossed threads, defective apertures, etc.
    Bob Salomon, Dec 6, 2003
  4. Send it back. The fungus will also be elswhere in the lens
    than on the lens surface. Fungus will eventually etch the
    glass ruining it. While it _is_ possible to open up a lens
    and clean it I would not recommend that here unless you got
    this thing very cheaply.
    Exposure to sunlight, often recommended for getting rid of
    fungus probably only puts into an inactive state awaiting
    only moisture to make it active again.
    Richard Knoppow, Dec 7, 2003
  5. That is too much to pay for a lens with fungus, but you may want to
    see if it can be cleaned to like new condition by the factory service
    center for a reasonable cost and try to get the seller to pay for
    the repair.

    J. C. O'Connell, Dec 7, 2003
  6. JCJeski

    Bob Salomon Guest

    We are the US service center and it can not be sucessfully repaired. It
    will only get worse.
    Bob Salomon, Dec 7, 2003
  7. Good answer, but I thought it would be a good idea to explain it.

    The only way to fix it is to buy another lens that has a physical, but
    not optical defect and combine them. Considering the labor would cost
    you $50 to $100, unless you can repair lenses on your own, it is not
    worth more than $5-$10.

    As for it "only getting worse", the fungs grows on dust in the lens
    when exposed to humidity. If you were able to remove the dust and fungus
    completely, and keep the lens in a very low humidity environment, it would
    not get any worse. But it certainly would not get any better.

    In my case there is a 50-50 chance I could take the lens apart and get it
    back together and still have it work. If I had 4 or 5 hours to spend
    disasembling the lens (I'm not a fast worker on this stuff) and cleaned
    it out, relubed it and got it to work when I was done, I still would not
    pay anything for it. And very likely it would sit in a drawer, getting
    worse until I got a "round tuit". :)


    Geoffrey S. Mendelson, Dec 7, 2003
  8. JCJeski

    Bob Salomon Guest

    You still have not answered which 80mm you have.

    Your cure above is overly simplistic. The actual focal length of any
    given lens is ± the marked focal length. The front and rear groups are
    matched at the factory for any specific lens by serial number. You would
    have to find a second 80mm with a bad front element that exactly matches
    the specifications of your lens.

    It would be simpler to simply find a good second lens and use that. But
    if you have the choice you want the newer Apo RODAGON N version rather
    then the older versions.
    Bob Salomon, Dec 7, 2003
  9. I got a Tokina 80-200/2,8 Lens for 25 Euro. Full of fungus, and a littel
    damaged bajonett.

    I opened it, cleaned the lenses (all lens surfaces expected the cemented
    ones) with accid cleaner and Alcohol (Isopropanol) afterwards. All visible
    fungus is gone.

    Let the lenses dry properly and reassemled the lens.
    I do not know how long the lens stays fungusless.

    On a Rodagon enlarging lens I tried some time earlier the same, but the
    fungus don´t dissappereard, it gets even worse.

    Markus Keinath, Dec 8, 2003
  10. We have enlarger lenses from Schneider, Nikon and Rodenstock, all in
    the same environment, and the only one with fungus is the Rodenstock
    although it is far from being the oldest.
    John Stockdale, Dec 9, 2003
  11. JCJeski

    ROBMURR Guest

    My Nikkor 50mm F4 lens had fungus
    inside and a bit of dust. I was able
    to take it apart with the tools I had
    and used anti fungal foot spray on the
    lens element and let it set for a while.
    Came back and cleaned it up with
    some alcohol then lens cleaner and
    put it back together, looks like new
    now. Of course this is a much cheaper
    lens than yours so I did not care if it
    never worked again...a good repair
    shop can get it cleaned for you then
    keep it dry and it may last forever...
    But if you can return it and get another..
    that would be my first choice.
    ROBMURR, Dec 10, 2003
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