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Thread: Lens problem

  1. #1

    Default Lens problem

    Hi guys,

    I had recently acquired this from a sale. I need someone's help to point me in the right directions how I can take apart this lens and clean it. It looks like it's got fungus?? Sorry I am still on a learning path with cameras.





    There are a total of 8 screws at the rear lens... just take them out and I'll be on my way??

    Should i just run a film thru it first without cleaning it and see if it turns out fine or will it just be a waste of film?

  2. #2

    Default Re: Lens problem

    I think that the lens coating has come off.Don't think thats fungus...Correct me if I am wrong.Try taking a photo with it and you can see whether photo is affected.

  3. #3
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    Default Re: Lens problem

    I don't think it's that easy to dismantle a lens...

    Were you aware of this prior to purchasing the lens?

  4. #4

    Default Re: Lens problem

    yup.. I'm well aware. Jus thought I might be adventurous n meddle wit it.. But I couldn't find any instructions online.

  5. #5
    Moderator Octarine's Avatar
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    Default Re: Lens problem

    Maybe you have a look here: http://www.clubsnap.com/forums/showthread.php?t=410795
    Contact fatigue for more details. Hope you can clean your lens

  6. #6

    Default Re: Lens problem

    Mount it and look through viewfinder?
    Meow!

  7. #7

    Default Re: Lens problem

    Mounted and looks fine over the viewfinder... still wondering if it'll be a waste of film to try a roll..

  8. #8

    Default Re: Lens problem

    aaah thts the mamiya slr in sungei road issit? tht cam looks good man, pity I didnt have enough to get it, the apek quoted 60 for it. how much u got it for man?

  9. #9

    Default Re: Lens problem

    eh~~ no. I bought it over from a friend for $50 bucks.

  10. #10

    Default Re: Lens problem

    ahaks! my bad

  11. #11

    Default Re: Lens problem

    U got try wiping it with lens tissue and alcohol? It looks like an oil stain to me.

  12. #12
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    Default Re: Lens problem

    Quote Originally Posted by dision View Post
    U got try wiping it with lens tissue and alcohol? It looks like an oil stain to me.
    PLEASE DO NOT RUB WITH ALCOHOL.

    You never know how aggressive the alcohol will be and what it'll do to your lens + lens coatings.

  13. #13
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    Default Re: Lens problem

    Quote Originally Posted by calebk View Post
    PLEASE DO NOT RUB WITH ALCOHOL.

    You never know how aggressive the alcohol will be and what it'll do to your lens + lens coatings.
    Alcohol is fine lah! Many lens cleaners contain alcohol, or methanol (last one is toxic though). This particular lens has its lens elements come off from each other, the lens elements are 'kitted' together with a glue like substance, and this material has deteriotated over the years or due to incorrect storage.......the only way to repair it is to dekit it. But if you think it will not affect the image just leave it as it is

    HS

  14. #14
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    Default Re: Lens problem

    Quote Originally Posted by calebk View Post
    PLEASE DO NOT RUB WITH ALCOHOL.

    You never know how aggressive the alcohol will be and what it'll do to your lens + lens coatings.
    hmm?

    I'm not sure about that but Nikon lens manuals state that cleaning with alcohol is A-OK
    Last edited by Daedalus Trent; 7th October 2008 at 12:58 PM.

  15. #15

    Default Re: Lens problem

    Quote Originally Posted by calebk View Post
    PLEASE DO NOT RUB WITH ALCOHOL.

    You never know how aggressive the alcohol will be and what it'll do to your lens + lens coatings.
    I thought Eclipse solution is largely based on methanol.

  16. #16
    Moderator Octarine's Avatar
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    Default Re: Lens problem

    Quote Originally Posted by estel View Post
    I thought Eclipse solution is largely based on methanol.
    Alcohol is just the trivial name for a large group of chemical substances called Alcohol or Alkanol: Methanol, Ethanol, Propanol, Butanol etc. Although chemically they belong to the same group they also have different characteristics. Secondly, most cleaning solutions contain more complicated versions of alcohol. A look at the list of content can help (if all ingredients are fully declared).
    But from the various restrictions in shipping it seems that Eclipse contains Methanol or similar, high flammable substances.

  17. #17
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    Default Re: Lens problem

    Quote Originally Posted by Daedalus Trent View Post
    hmm?

    I'm not sure about that but Nikon lens manuals state that cleaning with alcohol is A-OK
    Quote Originally Posted by estel View Post
    I thought Eclipse solution is largely based on methanol.
    Unless you're very sure what the alcohol cleaning solution is, best not to touch it with any cleaning solution at all. A friend of mine cleaned away his lens coatings, albeit due to ignorance, when he used a cleaning solution that was rather...unheard of.

  18. #18

    Default Re: Lens problem

    Quote Originally Posted by calebk View Post
    Unless you're very sure what the alcohol cleaning solution is, best not to touch it with any cleaning solution at all. A friend of mine cleaned away his lens coatings, albeit due to ignorance, when he used a cleaning solution that was rather...unheard of.
    of course no cleaning is better than any cleaning given that one has the option to stay clean, which isn't unfortunately an option in real life in general and in this case in particular. My problem here is whether alcohol is bad for lenses per se. *If* it is and *if* eclipse is based on alcohol, that would mean that eclipse is a no-no on lenses. Personally I don't think so. On methanol, Bob Atkins seems to agree:

    http://photo.net/digital-camera-shopping-forum/00GGNt

    I don't know if any usual alcohol is known to harm the lenses (say, as confirmed by Canon/Nikon), apart from anecdotal evidences. What's the best non-alcoholic solution to clean the lenses?

  19. #19

    Default Re: Lens problem

    also:

    http://www.bobatkins.com/photography..._cleaning.html

    TS: these posts come with the usual implied disclaimer of course.
    Last edited by estel; 7th October 2008 at 03:32 PM.

  20. #20

    Default Re: Lens problem

    I reccomend using the diluted Isopropyl alcohol(isopropanol) found in Guardian or Watsons. I heard using vodka works as well but I no guts to test myself. Isopropanol used at full strength might harm plastic lens elements and special glass coating so remember to dilute. Just remember to wet the lens tissue then wipe and not drip alcohol directly onto the lens. Wouldn't want the liquid to seep into the lens body through any small gaps.

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