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bongolia
Joined: 28 May 2019
Posts: 3
Location: United Kingdom
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 Posted: Tue May 28, 2019 3:27 pm Post subject: Pentacon 29mm 2.8 Fungus? Possible coating damage? |
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bongolia wrote:
Greetings everyone and thank you for having me! I bought this lens and I noticed some markings on an interior element which I assumed were fungus so I took it apart, located the element and soaked the offending surface in 6% hydrogen peroxide, rinsed it in soap and water then wiped it with alcohol before giving it a gentle polish. The marks look cleaner, maybe, ( ) but they're still there. I'm not sure if any of it has gone. It also doesn't look like typical fungus to me. Is it possibly the remains of badly damaged coating? If it IS damaged coating is it possible to remove it entirely without damaging the glass? It currently fogs the image enough to render it useless.
Thanks to DigiChromeEd for sorting out the image below!
Last edited by bongolia on Tue Jun 04, 2019 2:43 pm; edited 2 times in total |
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DigiChromeEd
Joined: 29 Dec 2009
Posts: 3462
Location: Northern Ireland
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| Posted: Tue May 28, 2019 3:33 pm Post subject: Re: Pentacon 29mm 2.8 Fungus? Possible coating damage? |
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DigiChromeEd wrote:
| bongolia wrote: |
Greetings everyone and thank you for having me! I bought this lens and I noticed some markings on an interior element which I assumed were fungus so I took it apart, located the element and soaked the offending surface in 6% hydrogen peroxide, rinsed it in soap and water then wiped it with alcohol before giving it a gentle polish. The marks look cleaner, maybe, () but they're still there. I'm not sure if any of it has gone. It also doesn't look like typical fungus to me. Is it possibly the remains of badly damaged coating? If it IS damaged coating is it possible to remove it entirely without damaging the glass? It currently fogs the image enough to render it useless.
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"I've got a Nikon camera, I like to take a photograph" - Paul Simon |
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aidaho
Joined: 29 Apr 2018
Posts: 456
Location: Ukraine
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| Posted: Wed May 29, 2019 2:40 pm Post subject: |
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aidaho wrote:
Hard to tell what this is.
What isn't fungus is usually lubricant residue.
Peroxide is useless against it and soap is only marginally better.
Try soaking in acetone/white spirit.
Most of the time haze/residue comes right off, thought some individual spots and blotches can be more resilient.
You'll have to clean it from solvent afterwards, since solvents leave their own residue too.
I use spare sensor cleaning fluid and swabs for final touches.
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kiddo
Joined: 29 Jun 2018
Posts: 1120
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| Posted: Wed May 29, 2019 11:27 pm Post subject: |
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kiddo wrote:
Seems like coatings have been affected ,a repolish might work, but I've got no experience with it. I have a Helios pretty much the same,tried many things ,acetone,peroxyde etc and nothing worked for affected coatings. The good thing is I'm using it for spares . |
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visualopsins
Joined: 05 Mar 2009
Posts: 10531
Location: California
Expire: 2025-04-11
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| Posted: Thu May 30, 2019 12:26 am Post subject: |
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visualopsins wrote:
I wonder what effect a coating of fine auto wax like carnauba has on what looks like corroded metal coating?
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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kiddo
Joined: 29 Jun 2018
Posts: 1120
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| Posted: Mon Jun 03, 2019 12:38 am Post subject: |
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kiddo wrote:
| visualopsins wrote: |
| I wonder what effect a coating of fine auto wax like carnauba has on what looks like corroded metal coating? |
What about cerium oxide? |
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visualopsins
Joined: 05 Mar 2009
Posts: 10531
Location: California
Expire: 2025-04-11
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| Posted: Mon Jun 03, 2019 12:59 am Post subject: |
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visualopsins wrote:
| kiddo wrote: |
| visualopsins wrote: |
| I wonder what effect a coating of fine auto wax like carnauba has on what looks like corroded metal coating? |
What about cerium oxide? |
For coating removal sure. I'm thinking wax would fill & clarify corrosion holes leaving good parts of coating intact.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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bongolia
Joined: 28 May 2019
Posts: 3
Location: United Kingdom
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| Posted: Tue Jun 04, 2019 2:40 pm Post subject: |
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bongolia wrote:
Well I've given it a pretty heavy dosage of peroxide then Isopropyl alcohol then soap. Whatever's on the lens just, maybe, looks a bit cleaner. I think polishing it myself sounds a bit woohoo at this stage but cereum oxide, despite not having a clue what it is, sounds like it may be worth a look! I'll check online now.
Oh, it's for polishing glass! Anyone carried this out without knackering the glass?
I'll give white spirit a shot first.
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bongolia
Joined: 28 May 2019
Posts: 3
Location: United Kingdom
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| Posted: Tue Jun 04, 2019 3:10 pm Post subject: |
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bongolia wrote:
No joy. |
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DigiChromeEd
Joined: 29 Dec 2009
Posts: 3462
Location: Northern Ireland
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| Posted: Tue Jun 04, 2019 3:29 pm Post subject: |
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DigiChromeEd wrote:
I think it may be time to source a cleaner example of this lens. 
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