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Firehand
Joined: 30 Jun 2015
Posts: 58
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 Posted: Tue Aug 30, 2016 7:02 am Post subject: Smudge/haze after fungus cleaning |
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Firehand wrote:
Yesterday i decided to clean the fungus from a cheap Olympus f.zuiko 50/1.8. As usual i used hydrogen peroxide. I did it to tens of lenses before. There are specimens that cannot be removed with hydrogen peroxide only then i mix it 50/50 with ammonia. In this case i didnt because the fungi disappeared.
Then i cleaned the glass with lens tissues and ROR but when i put it on the light i found that the glass has smudge/haze which cannot be cleaned in any way. I am not sure if its because of the hydrogen peroxide, ROR or the fungi. Here is a picture:
#1
Any advice? I can polish the glass but i want to know if anybody has experienced it before and what causes it. |
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zanxion72
Joined: 11 Dec 2012
Posts: 145
Location: Athens, Greece
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| Posted: Tue Aug 30, 2016 10:25 am Post subject: |
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zanxion72 wrote:
Polishing it yourself is out of question. In general having it polished and re-coated sometimes costs more than buying another one. What lens is it?
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Firehand
Joined: 30 Jun 2015
Posts: 58
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| Posted: Tue Aug 30, 2016 10:28 am Post subject: |
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Firehand wrote:
| zanxion72 wrote: |
| Polishing it yourself is out of question. In general having it polished and re-coated sometimes costs more than buying another one. What lens is it? |
Its a cheap Olympus f.zuiko 50/1.8 auto-s. I dont care much about it but wanna know what and how to avoid. |
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Lloydy
Joined: 02 Sep 2009
Posts: 7785
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Tue Aug 30, 2016 11:29 am Post subject: |
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Lloydy wrote:
I tried cleaning fungus out of a Zuiko 50 1.8 and made it worse, exactly the same problem with haze that couldn't be cleaned. I use cold cream to clean fungus, which isn't aggressive at all.
I stripped the lens and mounted an old folding camera lens in the helicoid, so I should have the glass somewhere  If I find it I'll try cleaning it again.
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Firehand
Joined: 30 Jun 2015
Posts: 58
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| Posted: Tue Aug 30, 2016 11:37 am Post subject: |
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Firehand wrote:
Hmm. This happens to me for first time. I cleaned/repaired many lenses. So it seems that these zuikos have some different coating. I can try to polish it with Cerium Oxide and Dremel removing the coating completely. |
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Excalibur
Joined: 19 Jul 2009
Posts: 5019
Location: UK
Expire: 2014-04-21
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| Posted: Tue Aug 30, 2016 11:59 am Post subject: |
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Excalibur wrote:
Well I have a Tokina zoom with the same problem i.e. it has a haze and it's behind the front element and nothing works removing it. Doesn't seem to affect the sharpness but probably reduces contrast .....as in theory a haze must have some effect.
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visualopsins
Joined: 05 Mar 2009
Posts: 10532
Location: California
Expire: 2025-04-11
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| Posted: Tue Aug 30, 2016 10:18 pm Post subject: |
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visualopsins wrote:
Soft coating(s) of internal surfaces of lens optics is not unknown! (Nor is etching due to fungal metabolic actions.)
Search for a thread listing these lenses?
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zanxion72
Joined: 11 Dec 2012
Posts: 145
Location: Athens, Greece
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| Posted: Wed Aug 31, 2016 4:07 am Post subject: |
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zanxion72 wrote:
I would just throw it away. If it is not a group of elements but a simple one, dip it in water with detergent overnight and see if it gets cleaned. If not don't spend more of your time with it, it won't go away.
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Firehand
Joined: 30 Jun 2015
Posts: 58
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| Posted: Wed Aug 31, 2016 5:23 am Post subject: |
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Firehand wrote:
| visualopsins wrote: |
Soft coating(s) of internal surfaces of lens optics is not unknown! (Nor is etching due to fungal metabolic actions.)
Search for a thread listing these lenses? |
Its the front element's outer surface. So the surface which should be the most durable. The fungus were only inside the group. Im very suspicious about the ROR lense cleaner. It always leave a tiny film when im cleaning the lens. Even that i use a short spray on the cloth. |
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