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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 22:07 |  #16

The lens is still in the bag with the rice, I think I'll leave it for another 24 hours just to be safe. I'm doubtful it is condensation, just because of the tiny size of each of the dots; however, I also don't think it is fungus, since most reports show fungus branching out with fibers.

If it turns out to be unaffected by the rice, I might try to disassemble the lens and clean it myself, depending on the quote I can get from Canon. I found a service manual online, and I am mechanically inclined. My main concern would be knocking something out of alignment.


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c2thew
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May 20, 2012 23:32 |  #17

FuriousNoodle wrote in post #14461206 (external link)
The lens is still in the bag with the rice, I think I'll leave it for another 24 hours just to be safe. I'm doubtful it is condensation, just because of the tiny size of each of the dots; however, I also don't think it is fungus, since most reports show fungus branching out with fibers.

If it turns out to be unaffected by the rice, I might try to disassemble the lens and clean it myself, depending on the quote I can get from Canon. I found a service manual online, and I am mechanically inclined. My main concern would be knocking something out of alignment.

if you can build a lego set, you can open up this lens. Just be sure not to force any screws as stripping them will stop any further disassembly progress. Be sure to post pictures


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KirkS518
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May 20, 2012 23:49 |  #18

This is so obvious....

Miniature aliens have landed. and are using your lens as a spawning site.


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macroimage
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May 20, 2012 23:52 |  #19

FuriousNoodle wrote in post #14457591 (external link)
I found nothing wrong with the photos.

This is the main thing. Don't worry about it. You could have a local repair shop look at it but if it is working well, why bother.

That doesn't look at all like fungus. It isn't good to shine a desklamp through your lens. It will show up things you didn't want to know.


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May 21, 2012 00:20 |  #20

I had a very similar sight on my sigma 17-50 and i thought it was on the inside but i rubbed my finger on the front element and it smudged so i gave it a good clean and no problems since.Yours might be on the inside but worth a check just in case.


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May 21, 2012 06:23 |  #21

c2thew wrote in post #14461535 (external link)
if you can build a lego set, you can open up this lens. Just be sure not to force any screws as stripping them will stop any further disassembly progress. Be sure to post pictures

I was pretty good with lego.

I think I can disassemble most lenses. But the assembly afterwards is sometimes not that easy. Especially zoom lenses are hard with many seperat moving groups. And AF lenses with all their cabels around are also a bit special. I don't like them.
I have repaired or internal cleaned primes like the FD 300/2.8L, 500/4.5L and 800/5.6. Meyer Trioplan 100/2,8, Helios 44, Nikon ED 180/2.8, and others.
And I have mount converted or mounted several other lenses.

Zoom lenses I use for parts, doesn't try to reassemble them. Some of the lenses in current zoom lenses are molded together. Not glued on their surfaces, but only connected on the rim.

Regarding the thing on the threadopener's lens: I saw something simmiliar on pictures of the Sigma 70-200/2.8 Apo lens. Seems to be a common problem there. And on the Canon EF 135/2.8 softfocus.
Could be grease evaporation or something like that.


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FuriousNoodle
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May 21, 2012 17:06 |  #22

Well....here we go. -?

IMAGE: http://dl.dropbox.com/u/60942779/2012-05-21%2017.02.32.jpg

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May 21, 2012 17:28 |  #23

Your braver than me!


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JHaegs
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May 21, 2012 17:43 |  #24

You've definitely got some big kahonas! (sp?)

I would have left it, unless it was showing up in the pics. Maybe there is a tutorial or YouTube vid out there that can help you with the process! Good luck and keep us posted.


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JHaegs
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May 21, 2012 17:45 |  #25

Actually, looking at your computer, you already found the tutorial. :)


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FuriousNoodle
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May 21, 2012 17:48 |  #26

Well, I'm stuck here. I don't see any screws left on the parts, and nothing will budge and I don't want to force anything.

IMAGE: http://dl.dropbox.com/u/60942779/2012-05-21%2017.44.41.jpg

Does anyone know if the lens in the USM assembly is even accessible? I'm thinking I might have to go at it from the front of the lens now.

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FuriousNoodle
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May 21, 2012 17:49 |  #27

JHaegs wrote in post #14465185 (external link)
Actually, looking at your computer, you already found the tutorial. :)

That tutorial is actually for the 70-200 f/4, but it did help me in the beginning steps.


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Davivascaino
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May 21, 2012 20:58 |  #28

I am sweating just by looking at lol


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May 21, 2012 22:40 |  #29

i would've left it alone if it wasn't affecting the pics...this is an exploded view of the older non IS model...doubt it would help:
http://www.micro-tools.net …on/EF%20300%204​.0%20L.pdf (external link)

good luck!


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FuriousNoodle
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May 21, 2012 22:44 |  #30

I've got the dots cleaned, will post a take down guide when its all back together! :D


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Is this fungus?
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