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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 11 Aug 2013 (Sunday) 05:53
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5D sensor marks???

Senior Member
581 posts
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Joined Dec 2004
Location: Auckland NZ
Aug 11, 2013 05:53 |  #1

Hi, I've got these marks in the corner of my 5D classic, and they seem to be behind the IR/AA filter glass.

Is this fungus? Is there any way to fix this?

Any help or advice welcome!

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Phil Fogle
5Dmk2; Zenitar 16mm, 17-40 f4L, 50 f1.4, Samyang 85 f1.4, 70-200 f4L

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Cream of the Crop
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Location: "...just south of the 23rd Paralell..."
Aug 11, 2013 07:11 |  #2

I'm no expert ie: it hasn't happened to me, but every discussion of fungus and every example I've seen of it has described and shown it as exactly that, so I would say that yep, that it's pretty well guanteed that is indeed fungus.
As for a fix, I can't help you there.

Regards, Phil
2013/14 CAMS Gold Accredited Photographer | 2010 & 2011 V8 Supercars Aust. Accredited Photographer | 2008, '09, '10 South Aus. Rally Photographer of the Year | Catch Fence Photos - 2009 Photo of the Year (external link)Finallist - 2014 NT Media Awards
"A bad day at the race track is better than a good day in the office" |​illmedia (external link)

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Location: Austin Texas - Lucca Italy
Aug 11, 2013 07:34 |  #3
bannedPermanent ban

Move quickly ... the fungus is coming and will blanket the entire Earth !!​m/forums/thread/305234​2 (external link)
Prevention is worth a pound of cure !

EL_PIC - RIT BS Photo '78 - Photomask Engineering Mgr
Canon DSLR - Nikon SLR - Phase One 60MP MFDSLR (external link)​m/el_pic/ (external link)​m/PhotoImageCreations (external link)

Listen! .... do you smell something?
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Aug 11, 2013 08:34 as a reply to  @ EL_PIC's post |  #4

Yep, that's fungus. The only thing to do would be to remove the filter and clean the actual sensor surface. This should only be done by an expert.


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Location: From Los Angeles, Living in São Paulo, Brazil
Aug 11, 2013 08:50 |  #5

Yep, fungus it is. My older Digital Rebel XT which I keep around to use in hazardous conditions (salt water spray, dust, sand, etc)has this kind of fungus. I tried to clean without success. Then I took it to the Canon rep here in Sao Paulo and they confirmed that it was fungus between the UV filter layer and the actual sensor face. The cost to clean is more than my older camera is worth.

I tried to create a negative image layer to cancel the fungus in Photo Shop. I only had partial success.

Still use the camera because other wise it works OK. The fungus is virtually invisible in most shots unless there is a light colored background like sky.


Cream of the Crop
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Joined Aug 2007
Location: San Jose, California
Aug 11, 2013 13:08 |  #6

That's fungus and you need to fix it quickly or it can infect other parts of the camera, or even the lenses you use upon it (if it hasn't already done so).

I would imaging in London you have some local camera repair people. Get the camera to them ASAP. They can tell you whether it makes more sense to replace the entire sensor assembly (after checking the rest of the camera to be sure there isn't fungus there, too). Or, there are folks who remove the AA filter for modification purposes, such as to convert the camera to IR or to leave off the AA fitler entirely for even sharper shots (but at the risk/cost of increased moiré in your images).

There are many types of fungus in the world. Some of it grows pretty quickly, likes dark and damp places. In camera gear it can permanently etch glass and ruin optical coatings. I don't imagine it's good for silicon wafers that camera sensors are made from, either.

If it were me, I would also be looking closely at any other gear you keep with the camera. Funguse can spread from one piece of gear to another. It sort of "blooms"and gives off tiny spores. I don't know if there are fungicides that can be used with camera gear to stop it. Usually it means disassembly and thorough cleaning of any infected bits with something that will kill the fungus and remove traces it's left behind.

To help prevent future problems you may want to get some sort of moisture absorbant product to keep with your gear. Not all fungus needs moisture to thrive, but a lot of it does. A packet of desiccant kept with your gear may reduce the risk of reoccurance. Hunting supply stores and others often sell a reusable type of desiccant that changes color when it's saturated with moisture, then you put it in an oven on low heat for a short time to dry it out and can reuse it over and over.

Alan Myers (external link) "Walk softly and carry a big lens."
5DII, 7DII(x2), 7D(x2) & other cameras. 10-22mm, Tokina 12-24/4, 20/2.8, TS 24/3.5L, 24-70/2.8L, 28/1.8, 28-135 IS (x2), TS 45/2.8, 50/1.4, Tamron 60/2.0, 70-200/4L IS, 70-200/2.8 IS, 85/1.8, Tamron 90/2.5 Macro, 100/2.8 USM, 100-400L II, 135/2L, 180/3.5L, 300/4L IS (x2), 300/2.8L IS, 500/4L IS, EF 1.4X II, EF 2X II. Flashes, studio strobes & various access. - FLICKR (external link) - ZENFOLIO (external link)

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5D sensor marks???
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