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03-12-2017, 10:53 AM   #1
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Possible Fungus on Lens?

Hello,

I do received a M50/1.7 for free by chance, and there is a suspicious white blot on one of the inner elements of the rear group. It is slightly larger than dust particle, and seems to be having a yellowish white color. Is there a way to identify whether it is fungus or not, and any suggestions on how to deal with it?

Sincerely

03-12-2017, 11:03 AM   #2
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pictures?
03-12-2017, 11:29 AM   #3
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QuoteOriginally posted by sergysergy Quote
pictures?
Well I tried to get one with my K-S2 and Tamron 90mm Macro, but failed to focus on that spot.
03-12-2017, 01:25 PM   #4
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manual focus should be able to?

03-12-2017, 04:57 PM   #5
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QuoteOriginally posted by starjedi Quote
manual focus should be able to?
Adaptall-2 lens, put to MFD, but still can't get the white dot down.
03-12-2017, 06:10 PM   #6
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Need to see a picture , but your description sounds more like balsam (cement) separation than fungus. Cant be repaired economically.

---------- Post added 03-13-2017 at 01:13 AM ----------

QuoteOriginally posted by butangmucat Quote
Adaptall-2 lens, put to MFD, but still can't get the white dot down.
Not trying to be funny, but if you cannot take a picture of the problem I would give up on the idea of using a manual focus lens like the M 50mm.
03-12-2017, 06:19 PM   #7
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QuoteOriginally posted by butangmucat Quote
Adaptall-2 lens, put to MFD, but still can't get the white dot down.
Probable some one cleaned the lens internally and scratched it there or it is Lens separation.I agree with the other poster about manual lenses for you. Maybe you shouldn't.
03-12-2017, 06:29 PM   #8
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QuoteOriginally posted by pschlute Quote
Need to see a picture , but your description sounds more like balsam (cement) separation than fungus. Cant be repaired economically.

---------- Post added 03-13-2017 at 01:13 AM ----------



Not trying to be funny, but if you cannot take a picture of the problem I would give up on the idea of using a manual focus lens like the M 50mm.


Here's the best I have, the small yellow dot around the center of the lens. I don't have anything to get closer.

03-12-2017, 06:32 PM   #9
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QuoteOriginally posted by butangmucat Quote

Here's the best I have, the small yellow dot around the center of the lens. I don't have anything to get closer.
My advice use it, and if you like it send it out to get professionally serviced or buy another on on E-BAY
03-12-2017, 06:44 PM   #10
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Could be anything. Just use it.
03-12-2017, 06:46 PM   #11
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QuoteOriginally posted by pschlute Quote
Could be anything. Just use it.
My worries is about fungus growth if I am taking it to the humid southern China for summer. It has some fine hairy details that the picture failed to show. If it's just condensed grease then I won't worry as much.
03-12-2017, 06:50 PM   #12
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That is just lens dust, or some of the coating came off. Not fungus, just use it
03-12-2017, 06:51 PM   #13
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QuoteOriginally posted by butangmucat Quote
My worries is about fungus growth if I am taking it to the humid southern China for summer. It has some fine hairy details that the picture failed to show. If it's just condensed grease then I won't worry as much.
Make sure you use silica gel pouches in all your camera equipment containers. Fungus spores are everywhere including your newer lenses and camera. You only see them grow when you introduce moisture and warmth.

If it is fungus and it grows just drop the lens in the nearest bin and buy another. They are ten a penny on ebay.
03-12-2017, 06:57 PM   #14
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QuoteOriginally posted by pschlute Quote
Make sure you use silica gel pouches in all your camera equipment containers. Fungus spores are everywhere including your newer lenses and camera. You only see them grow when you introduce moisture and warmth.

If it is fungus and it grows just drop the lens in the nearest bin and buy another. They are ten a penny on ebay.
That is correct
03-16-2017, 04:31 PM   #15
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Well what was the outcome?
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