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Lens problem - fungus??
Re: Lens problem - fungus??
On 19 Nov, 19:54, Peter Chant <REMpete...@CAPpetezilla,it ALSco.uk>
wrote:
> Peter Chant wrote:
> > It would appead from here that caustic cleaning agents are more of a
> > problem, however, there is reference to problems with an acid version of
> > windex. Not familiar with that product, as we don't have it over here.
>
> This site discusses use of ammonia, vinegar and naptha.
>
> http :// www .prairienet.org/b-wallen/BN Photo/GenTechLenses.htm
>
> -- http :// www .petezilla.co.uk
It doesn't "discuss" it. It mentions the use of ammonia and vinegar.
It would be wise to read it in context as it might apply to pre-coated
lenses.
On 19 Nov, 19:54, Peter Chant <REMpete...@CAPpetezilla,it ALSco.uk>
wrote:
> Peter Chant wrote:
> > It would appead from here that caustic cleaning agents are more of a
> > problem, however, there is reference to problems with an acid version of
> > windex. Not familiar with that product, as we don't have it over here.
>
> This site discusses use of ammonia, vinegar and naptha.
>
> http :// www .prairienet.org/b-wallen/BN Photo/GenTechLenses.htm
>
> -- http :// www .petezilla.co.uk
It doesn't "discuss" it. It mentions the use of ammonia and vinegar.
It would be wise to read it in context as it might apply to pre-coated
lenses.
Re: Lens problem - fungus??
RolandRB wrote:
>
> It doesn't "discuss" it. It mentions the use of ammonia and vinegar.
> It would be wise to read it in context as it might apply to pre-coated
> lenses.
OK, poor choice of words. Not trying to start an argument by the way, just
doing a bit of research. However, this is usenet and it is easy to give
the wrong impression.
Thanks for your comments.
I think before approaching diy of this sort you need to weigh up the
options - how much is it worth to fix by a professional, how much to simply
replace and how much will you be annoyed if it goes wrong. I suspect the
price of a repair would go a long way towards a replacement, and a
replacement would likely not have the fine scratches from cleaning like
this one.
Pete
--
http :// www .petezilla.co.uk
RolandRB wrote:
>
> It doesn't "discuss" it. It mentions the use of ammonia and vinegar.
> It would be wise to read it in context as it might apply to pre-coated
> lenses.
OK, poor choice of words. Not trying to start an argument by the way, just
doing a bit of research. However, this is usenet and it is easy to give
the wrong impression.
Thanks for your comments.
I think before approaching diy of this sort you need to weigh up the
options - how much is it worth to fix by a professional, how much to simply
replace and how much will you be annoyed if it goes wrong. I suspect the
price of a repair would go a long way towards a replacement, and a
replacement would likely not have the fine scratches from cleaning like
this one.
Pete
--
http :// www .petezilla.co.uk
Re: Lens problem - fungus??
In message <mahamantra-F8BBD2.22293115112007@reader1.panix,com >,
krishnananda <mahamantra@yahoo.in> writes
>Hydrofluoric acid does damage glass.
And bones - never get it on your skin.
--
Paul Friday
In message <mahamantra-F8BBD2.22293115112007@reader1.panix,com >,
krishnananda <mahamantra@yahoo.in> writes
>Hydrofluoric acid does damage glass.
And bones - never get it on your skin.
--
Paul Friday
Re: Lens problem - fungus??
Paul Friday wrote:
> And bones - never get it on your skin.
Isn't that the stuff that goes through your flesh and destroys the bone
underneath. Nice stuff. Interestingly apparently some of the damage
wrecked by fungus is the fungus excreting hydrofluoric acid. How does it
do it without killing itself?
To lower the tone, you think you've had it bad after a curry...
I spotted in an old photography book instructions on etching a photo onto
glass. It involved coating the glass with a albumen and a sensitising
agent and at some point using bitumen powder, to act as a mask, the bitumen
adhering to the emulsion created with the albumen and sensitising agent.
All fine up to now (ok powerdered bitumen anyone). I decided not to bother
when it required the glass plate to be held over fuming hydroflouric acid.
--
http :// www .petezilla.co.uk
Paul Friday wrote:
> And bones - never get it on your skin.
Isn't that the stuff that goes through your flesh and destroys the bone
underneath. Nice stuff. Interestingly apparently some of the damage
wrecked by fungus is the fungus excreting hydrofluoric acid. How does it
do it without killing itself?
To lower the tone, you think you've had it bad after a curry...
I spotted in an old photography book instructions on etching a photo onto
glass. It involved coating the glass with a albumen and a sensitising
agent and at some point using bitumen powder, to act as a mask, the bitumen
adhering to the emulsion created with the albumen and sensitising agent.
All fine up to now (ok powerdered bitumen anyone). I decided not to bother
when it required the glass plate to be held over fuming hydroflouric acid.
--
http :// www .petezilla.co.uk
Re: Lens problem - fungus??
On 21 Nov, 00:49, Paul Friday <De...@devce.demon.co.uk> wrote:
> In message <mahamantra-F8BBD2.22293115112...@reader1.panix,com >,
> krishnananda <mahaman...@yahoo.in> writes
>
> >Hydrofluoric acid does damage glass.
>
> And bones - never get it on your skin.
> --
> Paul Friday
It might be oxalic acid that the fungus is using. This is an organic
acid known to attack e-glass which is the glass used in glass fibre. E-
glass contains metal oxides to give it low electrical conductivity
properties (it also gives it increased strength) and optical glass
contains similar metal oxides, some of them the same. It will be a
very slow reaction, though. Not like watching hydrofluoric acid etch
glass.
On 21 Nov, 00:49, Paul Friday <De...@devce.demon.co.uk> wrote:
> In message <mahamantra-F8BBD2.22293115112...@reader1.panix,com >,
> krishnananda <mahaman...@yahoo.in> writes
>
> >Hydrofluoric acid does damage glass.
>
> And bones - never get it on your skin.
> --
> Paul Friday
It might be oxalic acid that the fungus is using. This is an organic
acid known to attack e-glass which is the glass used in glass fibre. E-
glass contains metal oxides to give it low electrical conductivity
properties (it also gives it increased strength) and optical glass
contains similar metal oxides, some of them the same. It will be a
very slow reaction, though. Not like watching hydrofluoric acid etch
glass.
Re: Lens problem - fungus??
In message
<93f994c8-cb02-428e-a2bc-70712262bd4e@w34g2000hsg.googlegroups,com >,
RolandRB <rolandberry@hotmail,com > writes
>It might be oxalic acid that the fungus is using.
Then keep your lenses away from rhubarb leaves.
On the other hand, a strong tea made from said leaves is good for
removing rust stains. Just don't drink the stuff.
--
Paul Friday
In message
<93f994c8-cb02-428e-a2bc-70712262bd4e@w34g2000hsg.googlegroups,com >,
RolandRB <rolandberry@hotmail,com > writes
>It might be oxalic acid that the fungus is using.
Then keep your lenses away from rhubarb leaves.
On the other hand, a strong tea made from said leaves is good for
removing rust stains. Just don't drink the stuff.
--
Paul Friday
Re: Lens problem - fungus??
On 22 Nov, 22:45, Paul Friday <De...@devce.demon.co.uk> wrote:
> In message
> <93f994c8-cb02-428e-a2bc-70712262b...@w34g2000hsg.googlegroups,com >,
> RolandRB <rolandbe...@hotmail,com > writes
>
> >It might be oxalic acid that the fungus is using.
>
> Then keep your lenses away from rhubarb leaves.
> On the other hand, a strong tea made from said leaves is good for
> removing rust stains. Just don't drink the stuff.
> --
> Paul Friday
Sage words from Paul. For those of you who store your lenses away
wrapped in rhubard leaves, think again!
On 22 Nov, 22:45, Paul Friday <De...@devce.demon.co.uk> wrote:
> In message
> <93f994c8-cb02-428e-a2bc-70712262b...@w34g2000hsg.googlegroups,com >,
> RolandRB <rolandbe...@hotmail,com > writes
>
> >It might be oxalic acid that the fungus is using.
>
> Then keep your lenses away from rhubarb leaves.
> On the other hand, a strong tea made from said leaves is good for
> removing rust stains. Just don't drink the stuff.
> --
> Paul Friday
Sage words from Paul. For those of you who store your lenses away
wrapped in rhubard leaves, think again!
Re: Lens problem - fungus??
RolandRB wrote:
> On 22 Nov, 22:45, Paul Friday <De...@devce.demon.co.uk> wrote:
>> In message
>> <93f994c8-cb02-428e-a2bc-70712262b...@w34g2000hsg.googlegroups,com >,
>> RolandRB <rolandbe...@hotmail,com > writes
>>
>> >It might be oxalic acid that the fungus is using.
>>
>> Then keep your lenses away from rhubarb leaves.
>> On the other hand, a strong tea made from said leaves is good for
>> removing rust stains. Just don't drink the stuff.
>> --
>> Paul Friday
>
> Sage words from Paul. For those of you who store your lenses away
> wrapped in rhubard leaves, think again!
Thyme to take heed.
--
http :// www .petezilla.co.uk
RolandRB wrote:
> On 22 Nov, 22:45, Paul Friday <De...@devce.demon.co.uk> wrote:
>> In message
>> <93f994c8-cb02-428e-a2bc-70712262b...@w34g2000hsg.googlegroups,com >,
>> RolandRB <rolandbe...@hotmail,com > writes
>>
>> >It might be oxalic acid that the fungus is using.
>>
>> Then keep your lenses away from rhubarb leaves.
>> On the other hand, a strong tea made from said leaves is good for
>> removing rust stains. Just don't drink the stuff.
>> --
>> Paul Friday
>
> Sage words from Paul. For those of you who store your lenses away
> wrapped in rhubard leaves, think again!
Thyme to take heed.
--
http :// www .petezilla.co.uk
