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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 May 2011 (Sunday) 11:29
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Little round white spots at ridges

 
EduardoJB
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May 22, 2011 11:29 |  #1

I took photos on a wet environment last week, and the camera bag is made of a thich canvas fabric. I did not use the 10-22mm EF-S under the rain, but there was a lot of humidity and I arrived home and kept the lens inside the bag until yesterday when I noticed perfectly round small white (or reflective, hard to distinguish) on the ridges inside the first glass element. They do not seem to be fungus (they're perfectly round) and apparently there's none on the glass. I looked through the back glass and couldn't see anything wrong. Also, there seems to be no image degradation. Very difficult to take a photo of the spots, these were taken with a macro. Any idea? Thank you


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Sdiver2489
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May 22, 2011 11:34 |  #2

If it wasn't you who posted it we just had another one of these exact same threads with the 10-22 a week or two ago. Conclusion was it was either ebola or the plague and to send it to canon.


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Scapevision
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May 22, 2011 11:44 |  #3

Congrats, you just got yourself a Christmas lens


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kauffman ­ v36
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May 22, 2011 11:48 |  #4

that looks identical to something large format users know as Schneideritis, something that old schneider lenses were famous for...except this is a canon lens, idk


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EduardoJB
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May 22, 2011 12:14 |  #5

No, I didn't post before, in fact I'm new to the forum. So… apparently no one knows

BTW, is there any way I can locate the previous post? (If it was helpful and not sarcastic)




  
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EduardoJB
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May 22, 2011 13:51 |  #6

BTW, Kauffman, it looks very much like what you describe. Thank you. Up to now, I haven't noticed anything wrong with the image quality, but I have no lab to do a more thorough test. And, yes, this is supposed to be a modern lens...




  
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WhyFi
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May 22, 2011 13:56 |  #7

Bake it.


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msowsun
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May 22, 2011 13:57 |  #8

EduardoJB wrote in post #12457482 (external link)
No, I didn't post before, in fact I'm new to the forum. So… apparently no one knows

BTW, is there any way I can locate the previous post? (If it was helpful and not sarcastic)

Here is the other thread: https://photography-on-the.net …1038789&highlig​ht=10-22mm

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EduardoJB
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May 22, 2011 16:10 |  #9

Thanks a lot, it's exactly the same thing




  
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ZoneV
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May 23, 2011 04:44 |  #10

Because I own several lenses with Schneideritis (from Schneider Kreuznach, a Porst and one from Vivitar - made in Germany) this is interessting for me.

It sound very interessting for me, that this look-alike Schneideritis probably is caused by humidity.
Probably the humidity could get inside the lens blackening paint?

So backing like WhyFi said could help.
I think this could help probably. But I suppose you need to control the temperature very exact, I would suggest 70-80° Celcius. And I would suggest to do that not with the whole lens, but dismantled.

Have to test that with one of my lenses :-)


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ZoneV
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May 23, 2011 17:22 |  #11

ZoneV wrote in post #12461812 (external link)
...
Have to test that with one of my lenses :-)

Have done that this evening.
~80° Celcius for 2.5 hours did not change the "Scheideritis" in my Schneider Kreuznach G-Claron :-/
Probably fresh Schneideritis behaves better?


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yjt
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May 23, 2011 17:23 |  #12

that looks really weird


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philwillmedia
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May 23, 2011 18:09 |  #13

Going by the info provided by the OP, my educated guess is that it's caused by condensation from the lens staying in the wet/damp bag as the bag dries out.


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KaBlookie
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May 23, 2011 19:28 |  #14

If that's in fact condensation then I'd maybe leave it submerged in a container of rice for a day or two...if condensation can get in, it can get back out. Worst case you just put a lens in a bunch of rice and wasted that rice :P


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msowsun
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May 23, 2011 20:03 |  #15

I don't think it is condensation. It looks to me more like residue left after condensation forms on a surface and then dries up.

Water vapor will usually have some kind of solid material in suspension and I think what you see is what is left after the condensation dries up.


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Little round white spots at ridges
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