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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 20 May 2012 (Sunday) 00:13
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Is this fungus?

 
FuriousNoodle
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May 20, 2012 00:13 |  #1

I just picked up a 300mm f/4L from Craigslist last Thursday; I paid $900 and the lens looked to be in pristine condition and functioned perfectly with date code UW. I shot a soccer game and a few bird shots with it, and I found nothing wrong with the photos. Today when I was cleaning the lens, I put it up to my desk lamp and saw this inside:

IMAGE: http://dl.dropbox.com/u/60942779/fungus/001.jpg
IMAGE: http://dl.dropbox.com/u/60942779/fungus/002.jpg

Is this fungus? It is on one of the inner elements, and is just little dots arranged in a circle slightly smaller than the actual element. If it is fungus, how bad? Is it cleanable?

The seller said he bought the lens off eBay and only used it for a zoo trip. I don't believe he knew about the fungus when selling it though, it is impossible to see unless held to light. Then again, I'll never know. I don't know if I should try to return it, which is notoriously hard to do with Craigslist deals, or send it in to get checked out which would cost who knows how much, or just live with it?

Any insight is appreciated.

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GregoryF
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May 20, 2012 00:34 |  #2

It is not fungus, but I am not sure what it is. It almost looks like airbubbles in the glass element.


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Rayk
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May 20, 2012 07:12 |  #3

I would say it is fungus, would Canon ship a lens with air bubbles in the glass?


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May 20, 2012 07:15 |  #4

Most likely moisture. Try putting it in a bag with (uncooked) rice.


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May 20, 2012 09:33 |  #5

Agree with WhyFi


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c2thew
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May 20, 2012 10:53 |  #6

looks like condensation


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GregoryF
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May 20, 2012 11:10 |  #7

Rayk wrote in post #14458290 (external link)
I would say it is fungus, would Canon ship a lens with air bubbles in the glass?

Have you ever seen fungus? This looks nothing like it. Condenation probably is the best suggestion and yes I have seen air bubbles in Canon lenses, but not to this degree.


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FuriousNoodle
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May 20, 2012 11:12 |  #8

I hope it's condensation, I have the lens in a bag of rice with as many silica gel packs as I could find. I'll see what happens tonight.

Any idea on how the condensation could reach a inner element while not affecting the others?


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WhyFi
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May 20, 2012 11:37 |  #9

FuriousNoodle wrote in post #14459002 (external link)
Any idea on how the condensation could reach a inner element while not affecting the others?

Even though it's (partially) weather sealed, I'd doubt that it's air-tight. Maybe more humid air made its way in at the focus ring? Who knows.


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rick_reno
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May 20, 2012 12:06 |  #10

If the rice doesn't help, it looks like it could be fungus




  
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Tellairai
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May 20, 2012 13:10 |  #11

I have had similar dots in a 50 1.4 and I sent the photo to canon and was asked if I had been flying with my lenses recently. Here's their response "There is one other possibility that the previous agent may not have
> thought of that may have caused this issue. I noticed that your email
> signature indicates that you work in the aerospace industry. If
you've
> taken this lens up on a flight in an unpressurized area of an aircraft
> at high altitudes, there is a possibility that the optical adhesives
> between some of the lens elements may have gassed out and produced a
> number of tiny bubbles that would appear as a cloud of tiny
> imperfections in the glass. The images you posted on
> photography-on-the.net definitely look like this phenomenon,
especially
> the very first image in the thread. These bubbles should disperse
after
> a while at ground level. If you travel on aircraft with your camera
> equipment frequently, please make sure your equipment is transported
in
> a pressurized compartment, or transport it in an airtight case such as
> an "otterbox" or "pelican" case.
>
> Please let us know if we can be of any further assistance with your EF
> 50mm f/1.4 USM lens."




  
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MrAl
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May 20, 2012 19:49 |  #12

Tellairai wrote in post #14459388 (external link)
I have had similar dots in a 50 1.4 and I sent the photo to canon and was asked if I had been flying with my lenses recently. Here's their response "There is one other possibility that the previous agent may not have
> thought of that may have caused this issue. I noticed that your email
> signature indicates that you work in the aerospace industry. If
you've
> taken this lens up on a flight in an unpressurized area of an aircraft
> at high altitudes, there is a possibility that the optical adhesives
> between some of the lens elements may have gassed out and produced a
> number of tiny bubbles that would appear as a cloud of tiny
> imperfections in the glass. The images you posted on
> photography-on-the.net definitely look like this phenomenon,
especially
> the very first image in the thread. These bubbles should disperse
after
> a while at ground level. If you travel on aircraft with your camera
> equipment frequently, please make sure your equipment is transported
in
> a pressurized compartment, or transport it in an airtight case such as
> an "otterbox" or "pelican" case.
>
> Please let us know if we can be of any further assistance with your EF
> 50mm f/1.4 USM lens."


Far out A lens with the bends. I can see this happening but not too sure about it ever returning to full normal again.




  
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azricano
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May 20, 2012 19:55 as a reply to  @ MrAl's post |  #13

My guess would be condensation, although you could never be too sure of these things.




  
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c2thew
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May 20, 2012 20:11 as a reply to  @ azricano's post |  #14

putting the lens in a bag of rice will not do anything. That condensation looks to already have entered the lens and dried up. Notice the waterspot appearance that you would see if you placed a wet mug on a glass table. It's the same idea. The only way to fix the problem would be to have a technician open it up or do it yourself (which is pretty nerve racking).


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WhyFi
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May 20, 2012 20:22 |  #15

c2thew wrote in post #14460675 (external link)
putting the lens in a bag of rice will not do anything. That condensation looks to already have entered the lens and dried up. Notice the waterspot appearance that you would see if you placed a wet mug on a glass table. It's the same idea.

You're making an awfully big assumption that it's dried and no, it's not the same idea as a wet mug on a glass table - the marks on a table are from particulates in the water, not the water itself. For humid air to have that much particulate matter is a big stretch.


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Is this fungus?
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