Interesting that site says that the fungus produces hydroflouric acid to etch
the lens.
Does anybody know if that is true, or just an an urban camera myth.
It seems hard to imagine a living fungus producing such a strong acid, but I
have no knowledge. A few other sites also mention explicitly hydroflouric, not
just "acid".
The GI tract produces fairly stong sulphuric acid, although it also produces
sacrificial mucous to protect the epithelial cells underneath, so I guess
possible.
Tim Hughes
--- On Tue, 11/10/09, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Subject: [OM] Separated Zuiko 250/2, was: Inside the Zuiko 300mm F4.5
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Date: Tuesday, November 10, 2009, 9:43 AM
I posted a note to the Yahoo camera repair group on re-cementing
elements and got this response
-----------------------------------------------------------------
Yes, go here:
<http://www.focalpointlens.com/fp_services.html#lens_separation>
If Zuiko used balsam, it should be repairable.
If Zuiko used UV epoxy, well, it may be hard to separate the lens
doublet. Maybe even impossible.
Good luck
Vick
To: camera-fix@xxxxxxxxxxxxxxx
From: chucknorcutt@xxxxxxxxxxxxxxxx
Date: Tue, 10 Nov 2009 12:03:25 -0500
Subject: [camera-fix] Source for cleaning and re-cementing separated
elements?
------------------------------------------------------------------
Chuck Norcutt
Chuck Norcutt wrote:
> But there are folks who specialize in cleaning and re-cementing
> separated elements. Given the value of the 250/2 it may be worth
> considering.
>
> Chuck Norcutt
>
>
> John Hermanson wrote:
>> Ouch. I'm happy to say that all the 300s I've come in contact with have
>> not been glued. Perhaps the ones I say at Olympus trying the patience
>> of the techs were an anomaly. Speaking of lens defects....that reminds
>> me that about a month ago, a customer in Norway sent me his 250 f2 due
>> to sticky focus ring and poor focus issues. I put the lens on my test
>> OM-2 and tried to focus out the back window. Focusing wide open on a
>> reasonably flat plane (a row of flat bushes) only a central circle was
>> sharp. The worlds most expensive "lens baby" ? The only defect I can
>> come up with is that it has a separated element which makes the lens
>> "beyond repair" (no parts available, and the elements were super
>> expensive when they were available).
>>
>>
>> ___________________________________
>> John Hermanson | CPS, Inc.
>> 21 South Ln., Huntington NY 11743
>> 631-424-2121 | www.zuiko.com
>> Olympus OM Service since 1977
>> Gallery: www.zuiko.com/album/index.html
>>
>>
>> Chuck Norcutt wrote:
>>> Oh, oh! I forgot that this is the lens apparently assembled with super
>>> glue.
>>>
>>> Chuck Norcutt
>>>
>>>
>>> John Hermanson wrote:
>>>> 300 4.5 with oil on the blades. A fun job! :-)
>>>> ___________________________________
>>>> John Hermanson | CPS, Inc.
>>>> 21 South Ln., Huntington NY 11743
>>>> 631-424-2121 | www.zuiko.com
>>>> Olympus OM Service since 1977
>>>> Gallery: www.zuiko.com/album/index.html
>>>>
>>>>
>>>> Carlos J. Santisteban wrote:
>>>>> Hi all,
>>>>>
>>>>> An unusual view of my F.Zuiko 300mm F4.5: <
>>>>> http://www.flickr.com/photos/zuiko21/4085731295/>
>>>>>
>>>>> Taken with my new Lumix GF-1 (plus 20mm F1.7) -- review coming soon!
>>>>>
>>>>> The previous picture in my gallery is the only other one taken with this
>>>>> little camera, buy maybe not up to anyone's taste. Lots more (either film
>>>>> or
>>>>> digital) will be uploaded shortly -- I hope!
>>>>>
>>>>> Cheers,
--
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