If I recall my high school chemistry correctly, hydroflouric is the only
acid that cannot be contained in glass. At least that was the story 60
years ago. I believe it was normally stored in a special wax-lined
container.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Tim Hughes" <timhughes@xxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Thursday, November 12, 2009 1:06 AM
Subject: Re: [OM] Separated Zuiko 250/2, was: Inside the Zuiko 300mm F4.5
> 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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> _________________________________________________________________
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>
>
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