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Thread: How to inspect a lens to see if there's fungus?

  1. #1

    Default How to inspect a lens to see if there's fungus?

    As above,

    wondering that are the best methods to make sure a lens is free of fungus before purchasing. even if its a new lens, should inspect properly, as new lens in the shop are not stored in dry boxes yeah?

    Am thinking of looking into the rear/elements and shine a torch at the other end, will it reveal all fungi?

    any advice is appreciated.

  2. #2

  3. #3

    Default

    If it's there, u will see it. If u are wonder how it look like then most likely there are no fungus yet

    Anyway, early stages of fungus look like snow flake. After that it look like spider web when it grow more then it will look like there's a large cotton wool stuck in between the element

    If u see something like snow flake, u can start to sing "sakura, sakura, la-la-la-la-la-la-la-la".

  4. #4

    Default Pretty simple...

    Hi!

    If you are to look through the lens from the rear (mounting point), try to look for spidery web-like patterns on the lens surface. It takes a while to practice how to look at the lens surface rather than looking 'through' it. You could then zoom in and out and these patterns will move forward and backward, thus telling you which lens element is infected. This way is much better then to mount the lens, look thru the viewfinder and try to detect a milky, blurred image.

    Try to purchase lenses from larger shops that moves stocks faster than smaller ones. Then you can be assured to a degree that the stocks are new. Major lens companies use anti-fungus methods (eg. gassing) to prevent growth anyway, so don't worry too much about fungus on new lenses!

    Cheers!

  5. #5
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    Default

    Quote Originally Posted by di0nysus
    Am thinking of looking into the rear/elements and shine a torch at the other end, will it reveal all fungi?
    yes, that's the absolute best way to check for fungus or dust. shine a torch thru and every defect is clearly visible...

    just remember not to stick the torch up too close. later you scratch the elements...

  6. #6
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    Default

    try to shine the torch from the rear element side and view the lens through the front element - there will be a "macro" magnification effect, and if there's anything, you will be able to see it REALLY easily.

  7. #7
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    Default

    Hi,

    Found one of my lens (Tokina 28-70 f2.8) has some fungus growth.
    Any recommendation on a good / realiable shop that can do the cleaning & how much is it? Will the fungus comes back again after cleaning?

    Thanks.

  8. #8

    Default

    Hi all, thanks for replying. Did the torch tests to my lenses, no mushrooms in sight.*phew* but can see more dust than the naked eye can with ambient light.

    Greg: try maybe TCW, no idea on the price. gd luck!

  9. #9

    Default

    Quote Originally Posted by GregLye
    Hi,

    Found one of my lens (Tokina 28-70 f2.8) has some fungus growth.
    Any recommendation on a good / realiable shop that can do the cleaning & how much is it? Will the fungus comes back again after cleaning?

    Thanks.
    You may want to try Camera Hospital at Sunshine Plaza, Bencoolen St. (Steven @ 6336-0025). You can ask for his quote thru phone. Hope it helps.

  10. #10

    Default

    Quote Originally Posted by GregLye
    Hi,

    Found one of my lens (Tokina 28-70 f2.8) has some fungus growth.
    Any recommendation on a good / realiable shop that can do the cleaning & how much is it? Will the fungus comes back again after cleaning?

    Thanks.
    Once there is fungus growth, it is as good as sayonara. The fungus has "eaten" the multicoat surface of the lens. When u clean it, it means that the portion where the fungus was growing, there will be no more multicoating left.

    After cleaning, it will still come back if do not leave it in the dry box when you are not using it.

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