Possible Fungus on Lens?

butangmucat · 03-12-2017, 10:53 AM

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

**sergysergy** · 03-12-2017, 11:03 AM

pictures?

butangmucat · 03-12-2017, 11:29 AM

Originally posted by sergysergy

pictures?

Well I tried to get one with my K-S2 and Tamron 90mm Macro, but failed to focus on that spot.

starjedi · 03-12-2017, 01:25 PM

manual focus should be able to？

butangmucat · 03-12-2017, 04:57 PM

Originally posted by starjedi

manual focus should be able to？

Adaptall-2 lens, put to MFD, but still can't get the white dot down.

pschlute · 03-12-2017, 06:10 PM

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 ----------

Originally posted by butangmucat

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.

**niceshot** · 03-12-2017, 06:19 PM

Originally posted by butangmucat

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.

butangmucat · 03-12-2017, 06:29 PM

Originally posted by pschlute

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.

**niceshot** · 03-12-2017, 06:32 PM

Originally posted by butangmucat

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

pschlute · 03-12-2017, 06:44 PM

Could be anything. Just use it.

butangmucat · 03-12-2017, 06:46 PM

Originally posted by pschlute

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.

**niceshot** · 03-12-2017, 06:50 PM

That is just lens dust, or some of the coating came off. Not fungus, just use it

pschlute · 03-12-2017, 06:51 PM

Originally posted by butangmucat

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.

**niceshot** · 03-12-2017, 06:57 PM

Originally posted by pschlute

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

**niceshot** · 03-16-2017, 04:31 PM

Well what was the outcome?

03-12-2017, 10:53 AM	#1
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709	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

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03-12-2017, 11:03 AM	#2
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,175	pictures?

03-12-2017, 11:29 AM	#3
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by sergysergy 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
starjedi Veteran Member Join Date: Dec 2013 Location: New Jersey Posts: 932	manual focus should be able to？

03-12-2017, 04:57 PM	#5
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by starjedi 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
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,218	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 ---------- Originally posted by butangmucat 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
niceshot Site Supporter Join Date: Mar 2014 Location: NY Photos: Gallery Posts: 1,565	Originally posted by butangmucat 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
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by pschlute 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
niceshot Site Supporter Join Date: Mar 2014 Location: NY Photos: Gallery Posts: 1,565	Originally posted by butangmucat 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
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,218	Could be anything. Just use it.

03-12-2017, 06:46 PM	#11
butangmucat Veteran Member Join Date: Jul 2016 Posts: 709 Original Poster	Originally posted by pschlute 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
niceshot Site Supporter Join Date: Mar 2014 Location: NY Photos: Gallery Posts: 1,565	That is just lens dust, or some of the coating came off. Not fungus, just use it

03-12-2017, 06:51 PM	#13
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,218	Originally posted by butangmucat 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
niceshot Site Supporter Join Date: Mar 2014 Location: NY Photos: Gallery Posts: 1,565	Originally posted by pschlute 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
niceshot Site Supporter Join Date: Mar 2014 Location: NY Photos: Gallery Posts: 1,565	Well what was the outcome?