Is this fungus??
p.1 #1Is this fungus??
Below are 3 pics of the extreme edges of a Sony 35 F2.8 lens. Cosmetically, the lens looks new, and looking at the glass, you don't really see it.
Thoughts??
Thoughts??
Jul 25, 2026 at 04:28 PM
p.1 #3Is this fungus??
That does not look like fungus to me but rather some grime
Jul 25, 2026 at 04:44 PM
p.1 #4Is this fungus??
lattesweden wrote:
Is it on the inside or outside?
I'm asking the guy who has it... I'll report back
Is it on the inside or outside?
I'm asking the guy who has it... I'll report back
Jul 25, 2026 at 04:47 PM
p.1 #5Is this fungus??
leolab wrote:
That does not look like fungus to me but rather some grime
That's what I thought... but we'll see.
That does not look like fungus to me but rather some grime
That's what I thought... but we'll see.
Jul 25, 2026 at 04:47 PM
p.1 #6Is this fungus??
That looks like one type of fungus. It looks like that or develops “webs.”
The good news is if you have it disassembled and cleaned, there’s likely no, or not enough damage to affect performance. The bad news is that might cost more than the lens is worth.
Oh, and fungus is contagious, so do not store that lens with any other camera gear!
Edited on Jul 25, 2026 at 05:21 PM · View previous versions
The good news is if you have it disassembled and cleaned, there’s likely no, or not enough damage to affect performance. The bad news is that might cost more than the lens is worth.
Oh, and fungus is contagious, so do not store that lens with any other camera gear!
Edited on Jul 25, 2026 at 05:21 PM · View previous versions
Jul 25, 2026 at 05:06 PM
p.1 #8Is this fungus??
I had a lens with it years ago. As others have said it looked more like a spider's web or snowflake. I don't believe that is it.
Jul 25, 2026 at 05:24 PM
p.1 #9Is this fungus??
Donzo98 wrote:
Here's what Chat GPT thinks...
https://donzo98.com/2026Pics/Chat.jpg
Chat GPT: "What I'd do"
Here's what Chat GPT thinks...
https://donzo98.com/2026Pics/Chat.jpg
Chat GPT: "What I'd do"
Jul 25, 2026 at 06:09 PM
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p.1 #10Is this fungus??
There appears to be leans wipe/cleaning residue around it, so whatever it is it appears he's tried to clean it away and was unsuccessful, implying it's on the inside of the element.
Jul 25, 2026 at 06:26 PM
p.1 #11Is this fungus??
I've a lens that has this (at the edges of the elements), but my lens is 70 years old. I don't think its fungus because for my lens, it is clear when i look through it, but at an angle these marks appear - which tells me it is either cleaning residue (which wouldn't be the case for that 35mm lens if the lens was never cleaned) or maybe some sort of delamination or separation (which i think is the case for my lens and may be the case for that 35mm lens). It could also be some lubricant degassing. While the 35mm lens might not be too old, factors such as hot weather might result in degassing or separation. Might want to see a cross section of the lens to have an idea of which elements are affected if they are single lens groups rather than e.g. doublets, it wouldn't be separation either.
Jul 26, 2026 at 01:14 AM
p.1 #12Is this fungus??
I had a lens with fungus that looked just like that.
Using the Chat GPT information, they are seed points.
I just called them spots. I had many more, maybe 20 spots when I first noticed.
It was my Voigtlander APO 50, which was probably fortunate as simple to work on.
(Repair shop did it, simple meant low cost)
Using the Chat GPT information, they are seed points.
I just called them spots. I had many more, maybe 20 spots when I first noticed.
It was my Voigtlander APO 50, which was probably fortunate as simple to work on.
(Repair shop did it, simple meant low cost)
Jul 26, 2026 at 03:25 AM
p.1 #13Is this fungus??
I had a lens with fungus that looked just like that.
Using the Chat GPT information, they are seed points.
I just called them spots. I had many more, maybe 20 spots when I first noticed.
It was my Voigtlander APO 50, which was probably fortunate as simple to work on.
(Repair shop did it, simple meant low cost)
Maybe ChatGPT is contradicting itself, seed points lead to radiating patterns. Possible you'll see radiating patterns later.
Using the Chat GPT information, they are seed points.
I just called them spots. I had many more, maybe 20 spots when I first noticed.
It was my Voigtlander APO 50, which was probably fortunate as simple to work on.
(Repair shop did it, simple meant low cost)
Maybe ChatGPT is contradicting itself, seed points lead to radiating patterns. Possible you'll see radiating patterns later.
Jul 26, 2026 at 03:25 AM
p.1 #14Is this fungus??
Here's a fun experiment: type "is this lens fungus?" into google, and browse through some reddit threads and/or threads on other forums. What you will see is that, basically without exception, every single thread has a number of people who will call anything fungus, even when it is clearly not fungus. If you post a picture of a lens on the internet, some percentage of people are invariably going to tell you you have fungus.
I highly, highly, *highly* doubt that what you've posted is fungus, and I'm confident that if you take a light to any other lens you own, you'll be able to find some other "questionable" spots that in reality are just dust, or grime, or delamination, or a little lens cement, or just a weird spot from when you sneezed without fully covering your mouth while you were swapping lenses.
Rest easy.
I highly, highly, *highly* doubt that what you've posted is fungus, and I'm confident that if you take a light to any other lens you own, you'll be able to find some other "questionable" spots that in reality are just dust, or grime, or delamination, or a little lens cement, or just a weird spot from when you sneezed without fully covering your mouth while you were swapping lenses.
Rest easy.
Jul 26, 2026 at 04:47 AM
p.1 #15Is this fungus??
snapsy wrote:
There appears to be leans wipe/cleaning residue around it, so whatever it is it appears he's tried to clean it away and was unsuccessful, implying it's on the inside of the element.
Shockingly... he never tried to clean it
There appears to be leans wipe/cleaning residue around it, so whatever it is it appears he's tried to clean it away and was unsuccessful, implying it's on the inside of the element.
Shockingly... he never tried to clean it
Jul 26, 2026 at 07:07 AM
p.1 #16Is this fungus??
Is the current owner of the lens the original owner of the lens?
Jul 27, 2026 at 03:40 AM
p.1 #17Is this fungus??
Slalom wrote:
Is the current owner of the lens the original owner of the lens?
No...
Is the current owner of the lens the original owner of the lens?
No...
Jul 27, 2026 at 09:17 AM