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Take care when cleaning lens from fungus
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PostPosted: Mon Dec 29, 2014 7:05 pm    Post subject: Reply with quote

Hi, today I realized I've got many of lens attacked by fungus during Winter: Tair 133 (very obvious fungus), Trioplan 100, Triotar 135 and Tair 300 starting to be as well. I plainly underestimated the situation, having long-term humidity problems in my house, especially at one of the corners my lenses are currently stored.

Never facing such a stupid crappy organism, I wonder what to do next? My only "weapons" are one small silica gel package, lot of various lights in my room and two corners with significantly lower humidity (you can actually see that from walls).

Can I save (or at least stabilize) the situation simply by putting lens into an open vitrine with light source installed in? Of course without caps, I believe dust can be always easily removed, have some basic tools for it. Wouldn't that be better than dark, humid, relatively warm corner of my wardrobe (or what is it actually) and with caps?

If having some not yet infected lens (or at least not visible), like Telemegor 180, Helios 40 (living with me for not a long time, actually), or some apparently more fungus-resistant modern lenses, should I keep them as far as possible or is this just a blind myth?

Seems to be a rather seasonal problem. Like the lens might miss especially the sun or possibly light source of any kind. Didn't have that problem in Summer perhaps because majority of lens was just frequently in use.

Thanks for any help. Ain't going to underestimate that crap again.


PostPosted: Tue May 19, 2015 3:39 pm    Post subject: Reply with quote

Just a word of warning... If you leave the lens in an acid long enough, it can strip the metal coatings off the glass. May take a long time but soaking an element in vinegar long enough could do this. Note that I haven't tried to find out how much time is required, but I might to fix a lens with scratches in the coating that render it less than functional.


PostPosted: Sat Feb 02, 2019 4:00 am    Post subject: Reply with quote

I haven't seen any mention of the haze in the lenses ,posibly after the fungus cleaning. I have just cleaned a pentacon 200 with fungus ,which camed off pretty easy,as the fungus was on the edges and small, but after cleaning with isopropyl alcohol, there's still some haze in the glass. Anybody could tell me what opions are there to get rid of the haze? Maybe some hands cream polishing the lens? Sad


PostPosted: Sat Feb 02, 2019 12:36 pm    Post subject: Reply with quote

a20010494 wrote:
Quoted from pentaxforums:
If you can get the on your camera, they're great: any fungus they harbour is easily cleaned up with some clotrimazole cream.

True?



That's what I've been using for some years. Contained in the form of a tube of athlete's foot remedy. It has proved highly effective. As an experiment, I've washed off on my Takumar lenses and just buffed off on the PK lenses, to see if the Clotrimazole has any 'active' ability long term. As I only started doing this about 4 years ago, there's nothing to report.


For me, using Clotrimazole is an experiment, and on lenses I've paid relatively little for really, so to anyone wanting to try, I'd start there too.


PostPosted: Fri Mar 15, 2019 4:44 pm    Post subject: Reply with quote

Being new to the forum, please forgive if I missed this question being previously addressed -

Does anyone have experience using copper exposure as a fungicide? Not used for the cleaning per say, but rather to kill the mildew and as a separate preventative measure. I've recently seen demonstrated where one would put maybe 5 dollars worth of copper pennies into a few clean socks, which are then tied shut and heated in a clothes drier until as hot as they will get. The socks and lens then get sealed in a zip lock bag for several hours, while 1. copper released gasses, killing the mildew present and 2. The heated socks absorb any moisture present in the lens. Could be used to to desicate a wet lens or as treatment before/after actual cleaning process. Any thoughts? Thank you!


PostPosted: Fri Mar 15, 2019 6:03 pm    Post subject: Reply with quote

DaveBob wrote:
Being new to the forum, please forgive if I missed this question being previously addressed -

Does anyone have experience using copper exposure as a fungicide? Not used for the cleaning per say, but rather to kill the mildew and as a separate preventative measure. I've recently seen demonstrated where one would put maybe 5 dollars worth of copper pennies into a few clean socks, which are then tied shut and heated in a clothes drier until as hot as they will get. The socks and lens then get sealed in a zip lock bag for several hours, while 1. copper released gasses, killing the mildew present and 2. The heated socks absorb any moisture present in the lens. Could be used to to desicate a wet lens or as treatment before/after actual cleaning process. Any thoughts? Thank you!


Copper sulfate might work as it is a fungizide, but I honestely doubt that copper pennies will work - which "gases" are they supposed to give into the surrounding air??


PostPosted: Fri Mar 15, 2019 7:11 pm    Post subject: Reply with quote

Fungus doesn’t grow on surfaces treated with copper, such as sulfate in solution applied to wood.

First, most pennies are alloys no copper as the copper necessary costs nearly two cents!

Placing glass & metal next to hot object; the uneven heating worries about thermal stresses can break glass.


PostPosted: Sun Mar 17, 2019 2:58 am    Post subject: Reply with quote

visualopsins wrote:
Fungus doesn’t grow on surfaces treated with copper, such as sulfate in solution applied to wood.

First, most pennies are alloys no copper as the copper necessary costs nearly two cents!

Placing glass & metal next to hot object; the uneven heating worries about thermal stresses can break glass.


I don't know much about the actual composition of the coins these days, but did note that pennies definitely still oxidize green within a day when suspended in a closed jar containing a little bit of vinigar (aka the old statue of liberty science trick). They also do emit a noticeable oder (suspected too not be entirely from drugs and grubby fingers), when warmed in one's hand. The smell does become more pronounced the more they are heated... And does linger on the hands for an unnervingly long time, unless vigorously scrubbed with soap. I would think that these are good indicators that - while not pure enough to scrap for drugs - the copper content is still sufficiently high enough to emit "something smelly" and uniquely coppery.

Regarding glass damage - there was no mention of any direct contact being necessary and I absolutely am not suggesting to nestle the hot metal right up against the glass. I also do not think that using this trick was meant to circumvent the need to gradually acclimate cold lenses to room temperature. It seemed the reason for heating in a clothes drier was to limit the upper end of the heat, while getting the fumes rolling.

I haven't gone so far as to replicate the full demonstration I saw.... but that is mostly due to having no "clean" socks to spare for the purpose. I take it that this is more gnostic lore than what one would call common practice?


PostPosted: Mon Mar 18, 2019 11:22 am    Post subject: Reply with quote

DaveBob wrote:
Being new to the forum, please forgive if I missed this question being previously addressed -

Does anyone have experience using copper exposure as a fungicide? Not used for the cleaning per say, but rather to kill the mildew and as a separate preventative measure. I've recently seen demonstrated where one would put maybe 5 dollars worth of copper pennies into a few clean socks, which are then tied shut and heated in a clothes drier until as hot as they will get. The socks and lens then get sealed in a zip lock bag for several hours, while 1. copper released gasses, killing the mildew present and 2. The heated socks absorb any moisture present in the lens. Could be used to to desicate a wet lens or as treatment before/after actual cleaning process. Any thoughts? Thank you!


If this works it will be by removing the moisture in the lenses. Copper does not release any gases when heated to moderate temperatures, it melts at over 1000°C & doesn't boil till over 2500°C so it's not got any significant volatility. Copper oxide melts at a higher temperature (~1200°C) and even the sulfide doesn't melt till 500°C.

Any smell you get from the coins is not the copper itself, more likely from all the grubby paws it's been held by.