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Deurges
Tinkerer
Username: Deurges
Post Number: 1
Registered: 12-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 07, 2011 - 12:21 pm: | 
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I just bought online a perfectly looking Canon FDn 35mm F2.8. I received it today, and while it looks like new, I see what I think might be fungus. Whatever it is, it seems to be in the very back glass.
Can anyone confirm this for me? What should I do if it is fungus?
http://img716.imageshack.us/img716/4854/canonfd35mm2.jpg
http://img221.imageshack.us/img221/3339/canonfd35mm.jpg
Thanks! |
Deurges
Tinkerer
Username: Deurges
Post Number: 2
Registered: 12-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 07, 2011 - 06:09 pm: |
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There are 2 holes in the piece that has the glass with the strange formations around, I looked into my broken 28mm, and it also has them. I quickly made a tool to put it inside and twisted and it was a screw in part. It should be the same on?the 35mm, right? |
Jeffk
Tinkerer
Username: Jeffk
Post Number: 40
Registered: 10-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, December 07, 2011 - 09:10 pm: |
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Have you tried cleaning it with lens tissue or cloth and fluid? I would try that before starting to take apart the lens. |
Deurges
Tinkerer
Username: Deurges
Post Number: 3
Registered: 12-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 08, 2011 - 08:01 am: |
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Jeffk,
It's definitely inside. Yesterday I made a quick tool that fits inside the 2 holes, and it opened, so later today I'll check the inside of this piece, which I think is the problematic one, if not, it's going to be the other part of that piece.
Can I use a Q-Tip with lens cleaning fluid to clean? |
Barnum
Tinkerer
Username: Barnum
Post Number: 217
Registered: 10-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 08, 2011 - 12:38 pm: |
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Although I have never tried the technique, I have heard that vinegar destroys the fungi. |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 181
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 08, 2011 - 07:28 pm: |
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Also nose oil, and athletes foot cream.
PF |
Mr_tomcat123
Tinkerer
Username: Mr_tomcat123
Post Number: 6
Registered: 02-2011
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, December 09, 2011 - 10:38 pm: |
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If you're referring to those weird stuff around the edge of the glass, I'd say don't worry about it.
Many lenses project an image circle much bigger than the actual film area, so I doubt if you can see the fungi on your pictures.
And obviously, stopping down a stop and your aperture blades would be covering the fungi
if you're really worried about it, the Canon FD mount is long dead, and the 35 2.8 is a cheap lens so finding another one shouldn't be difficult.
Of course I understand how nice it is to own flawless glass (and how much fun it is to fix your own equipment! :D)... so if you feel like it, go ahead and fix it. Don't forget to let us know what removes the fungi! i have a few lenses with lots of fungi too!  |
Neuberger
Tinkerer
Username: Neuberger
Post Number: 56
Registered: 01-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, December 10, 2011 - 02:33 am: |
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There is a plenitude of info on fungus plus all sorts of related topics in this forum's archives. Some do know how to draw profit from this source of information, others do not.
Long-term members may feel like persistently holding hands when newbies keep asking the same questions over and again.
Is there life after breakfast (RDD)? Yes, obviously there is. |
Mndean
Tinkerer
Username: Mndean
Post Number: 271
Registered: 08-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, December 10, 2011 - 02:23 pm: |
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Due to micro 4/3 adapters and a certain amount of faddishness, the price of FD lenses has gone up a bit in the past year.
Personally, I don't mind repeating information if it helps. In this instance, I don't have anything to offer as the only lens I ever had with fungus (which was very bad), I dumped in the trash immediately. |
Cooltouch
Tinkerer
Username: Cooltouch
Post Number: 163
Registered: 01-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, December 11, 2011 - 10:50 am: |
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I was rather surprised to read in the MF Lenses forum recently that cold cream actually works very well for fungus removal. You slather it on, and let it sit for a day or so, and apparently the fungus comes right off. Haven't tried it yet, though, so I'm just passing it along.
I have successful removed light to moderate levels of fungus infestations with my thumb and fingers. I'll clean my hand to remove any possibility that I've got grit imbedded in the whorls of my fingerprints, and then I'll transfer oil from somewhere else, like my nose, onto my thumb and fingers, and then I just rub the snot out of the fungus. It takes some pretty firm rubbing, but this is usually enough to remove it completely. Last time I did this, which was less than a week ago, I successfully removed a few fungus spots from the interior of a Tamron 500mm mirror, from both the front and rear elements. Fortunately, Tamron did not put the mirror coating on the front surface of the rear element. The fungus was minor enough such that the coatings weren't damaged either.
Anyway, I wouldn't be too worried about damaging the lens if the fungus isn't too severe. Just give it a try; chances are you won't hurt anything. |
