Removing fungus from an older manual lens?

8 years 8 months ago #450241 by Ira Weber
I'm bidding on an older lens that has advertised it  has some fungus in it. It's kind of hard to tell from the photos.  I wanted to find out what is involved in getting fungus removed and also what generally is the cause of this?  (bad seals?)

I'm trying to determine how much I want to bid on this, depending on how much it's going to cost to repair. 


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8 years 8 months ago #450273 by JeremyS
I'm going to tell you right now, don't bid. 

As far as I know fungus is deadly to lenses and cannot be fixed easily. It would require a full dismantling of the lens and even then the repair would be iffy. It is caused by moisture getting inside of the lens and allowing fungus inside which causes it to grow. 


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8 years 8 months ago #450292 by Screamin Scott
Mild cases are easily cleaned up. More severe case will have etched the glass & will cause a severe loss of contrast. Best o avoid. Mild cases may not have much of an effect on the final image but why take that chance ?. If it's an exotic lens, I can see the interest, but not on run of the mill optics.

Scott Ditzel Photography

www.flickr.com/photos/screaminscott/

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8 years 8 months ago - 8 years 8 months ago #450308 by Joves
As said it takes disassembly of the lens. Which with a manual lens is not all that hard, if you are mechanically inclined. I did it with one of my Pentax's lenses that got dust inside of it once. I just cleaned the elements with acetone, and put it back together. But fungus as said can eat into the lens coating and screw the lens, as far as Image Quality. It really depends on how many of the elements have the fungus, and where they are as to whether it will affect its performance. I would pass on it myself.
Well unless you can get it dirt cheap. Then it would be a good lens to play with as far as learning how to work on them. Also is it a zoom, or a prime. Because zooms are more difficult to work on obviously, primes are simple.


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8 years 8 months ago #450339 by icepics
From what I've always understood fungus is hard to remove and better to avoid it. Unless as these guys said it's an unusual lens or there's some reason you want to chance it.

Sharon
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8 years 7 months ago #452409 by VanHalen5150
if its a super expensive or rare lens and you can get it cheap enough, maybe. I know KEH I believe and a few other places can disassemble the lens and clean and reseal it. But its a matter of what you pay for the lens, the cost of repair and final value. So call some repair places, get quotes, run the numbers and decide.

Either way, good luck!


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