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alo91
Joined: 20 Apr 2020
Posts: 18
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 Posted: Wed Jul 29, 2020 4:24 pm Post subject: Canon FD 55 1.1.2 S.S.C. fungus |
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alo91 wrote:
Hi,
I have a Canon FD 55 1.1.2 S.S.C. with a fungus on the rear element.
I took it to a repair shop but they said the glasses where the fungus is located are glued together.
However, I don't trust them so I'm not sure if they are right (There aren't good repair shops in my city).
Does anyone know if they are right and in that case what could I do?
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aidaho
Joined: 29 Apr 2018
Posts: 456
Location: Ukraine
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| Posted: Wed Jul 29, 2020 9:08 pm Post subject: Re: Canon FD 55 1.1.2 S.S.C. fungus |
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aidaho wrote:
| alo91 wrote: |
Hi,
I have a Canon FD 55 1.1.2 S.S.C. with a fungus on the rear element.
I took it to a repair shop but they said the glasses where the fungus is located are glued together.
However, I don't trust them so I'm not sure if they are right (There aren't good repair shops in my city).
Does anyone know if they are right and in that case what could I do? |
I don't think this is the case.
For fungus to get into doublet, I would expect some separation to occur first.
There might be one going on (separation can be extremely hard to see), but somehow I doubt it.
At the first glance this looks like pretty usual mild fungus.
I'd wager they just don't want to touch it, since it's a big time investment and thus not very profitable.
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alo91
Joined: 20 Apr 2020
Posts: 18
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| Posted: Wed Jul 29, 2020 10:21 pm Post subject: |
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alo91 wrote:
I thought the same because I suggested to them that I was scared about a fungus into doublet. However, is there a way to be sure if there is a doublet in this lens? I’m not able to find a scheme online |
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visualopsins
Joined: 05 Mar 2009
Posts: 10541
Location: California
Expire: 2025-04-11
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| Posted: Wed Jul 29, 2020 11:13 pm Post subject: |
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visualopsins wrote:
| alo91 wrote: |
| I thought the same because I suggested to them that I was scared about a fungus into doublet. However, is there a way to be sure if there is a doublet in this lens? I’m not able to find a scheme online |
https://en.wikipedia.org/wiki/Canon_FD_55mm_f/1.2_AL
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alo91
Joined: 20 Apr 2020
Posts: 18
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| Posted: Thu Jul 30, 2020 3:35 am Post subject: |
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alo91 wrote:
| visualopsins wrote: |
| https://en.wikipedia.org/wiki/Canon_FD_55mm_f/1.2_AL |
Mine is the S.S.C. version (without any Al or L or aspherical) and I’m not able to find the right scheme. |
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aidaho
Joined: 29 Apr 2018
Posts: 456
Location: Ukraine
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| Posted: Thu Jul 30, 2020 10:10 am Post subject: |
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aidaho wrote:
| alo91 wrote: |
| However, is there a way to be sure if there is a doublet in this lens? |
I've never seen a 7 element lens without at least one of those.
Again, I would just ignore the shop response and forget about the doublets.
But if you insist, it's listed as 7/5 on Canon official website, so there are two doublets inside:
https://web.archive.org/web/20150921153232/http://www.canon.com/camera-museum/lens/fd/data/50-85/fd_55_12.html
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Thu Jul 30, 2020 12:26 pm Post subject: |
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Gardener wrote:
It's not in the doublet. I concur with the opinion that they decided it's a PITA and they just did not want to deal with it.
PS. See that iridescent ring in the middle of the lens? That's the rear doublet. |
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alo91
Joined: 20 Apr 2020
Posts: 18
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| Posted: Thu Jul 30, 2020 7:09 pm Post subject: |
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alo91 wrote:
I think I founded the optical scheme and I really think that you were right to say that the fungus isn’t in the doublet.
The problem now is that in the past I have already token this lens to another store and they wasn’t able to remove that fungus.
What could be the problem? Maybe it’s not easy to remove the rear glass?
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Fri Jul 31, 2020 5:48 pm Post subject: |
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Gardener wrote:
| alo91 wrote: |
| What could be the problem? Maybe it’s not easy to remove the rear glass? |
From the looks of it, the rear element is glued into a metal sleeve which is screwed into the rear group assembly. Your second photo appears to show just where the connection point is. To me it looks separable, but it requires tools and the ability to get purchase to apply torque. It also depends on how well it is threadlocked. |
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justtorchit
Joined: 12 Oct 2009
Posts: 269
Location: St. Louis, MO
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| Posted: Sun Aug 02, 2020 1:59 pm Post subject: |
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justtorchit wrote:
I doesn't look too bad. Out of curiosity, what's your interest in cleaning it? I totally understand if it's just the peace of mind that the lens is completely clean throughout. I'm potentially looking at the same issue with one of my optics. But pragmatically speaking, I don't imagine this is affecting image quality too much, if at all. Just curious!
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alo91
Joined: 20 Apr 2020
Posts: 18
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| Posted: Thu Aug 06, 2020 3:01 pm Post subject: |
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alo91 wrote:
| justtorchit wrote: |
| I doesn't look too bad. Out of curiosity, what's your interest in cleaning it? I totally understand if it's just the peace of mind that the lens is completely clean throughout. I'm potentially looking at the same issue with one of my optics. But pragmatically speaking, I don't imagine this is affecting image quality too much, if at all. Just curious! |
Certainly, one of my motivations is to have perfectly clean lenses but I'm also worried that the fungus might get worse. I'm sure, although I've used it a lot, it's suddenly gotten worse. |
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smilebrain
Joined: 21 Sep 2020
Posts: 2
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| Posted: Mon Sep 21, 2020 6:55 pm Post subject: |
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smilebrain wrote:
@ alo91
Did you clean up the rear lenses?
I want to have them clean as well. Front lenses I have cleaned by myself.
But rear elements are different topic.
Kind regards
Mario
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Lenspool: Zeiss Loxia 21mm; 7Artisans 28mm 1.4; Voigtländer 40mm 1.2; Porst 50mm 1.4; Canon FD 55 1.2 SSC Aspherical; Samyang 85 1.4 (AF); Asahi Super Takumar 135mm 3.5; Tamron 28-75 (AF) |
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alo91
Joined: 20 Apr 2020
Posts: 18
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| Posted: Wed Oct 21, 2020 5:01 pm Post subject: |
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alo91 wrote:
| smilebrain wrote: |
@ alo91
Did you clean up the rear lenses?
I want to have them clean as well. Front lenses I have cleaned by myself.
But rear elements are different topic.
Kind regards
Mario |
Unfortunately no. I haven't been able to find how disassembly rear lenses, which are glued together, and then put them in the right position. |
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Argentikos
Joined: 12 Jan 2021
Posts: 1
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| Posted: Tue Jan 12, 2021 10:46 am Post subject: |
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Argentikos wrote:
the camera repair shop was right, you can't unglue the rear elements to clean this part of the lens.
A lot of the Canon Fd lenses have similar glued elements. |
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