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Legacy Lenses Discuss the use of older lenses, using adapters, from the Olympus OM system, Leica M and R-series, and the millions of others too.

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Old 23rd June 2013
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Fungus in lens

I dug my OM 300mm out this afternoon to find it has fungus growing in it. Does anyone know a good way of stopping it spreading further? I know it's almost impossible to kill without disassembling the lens but as I haven't used the lens since I tested it on my E-1 in 2006 so don't see the point in spending money on it.
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Old 25th June 2013
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Re: Fungus in lens

I have read somewhere that people put their lenses in clear plastic containers - without their caps, top and bottom, to let get light in during storage. The idea was, to prevent fungi growth. A good exposure to direct summer sunlight, especially UV, might kill what is apparently still alive!?
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Old 25th June 2013
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Re: Fungus in lens

This idea remind me that we have a UV light in our pond filter designed to kill off growing things. We also have UV lights in the fish tank and vivariums. Maybe put it in a tin foil lined shoebox with a UV lamp (be careful of any heat build up though if its an incandescent bulb).
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Old 25th June 2013
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Re: Fungus in lens

I've used this method for removing fungus on an old lens. It worked well, but the lens needs to be stripped down:

http://www.ehow.co.uk/how_7770957_cl...ngus-lens.html

Jim
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Old 25th June 2013
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Re: Fungus in lens

Researching it seems the sunlight trick isn't an effective method, you can't generate enough heat or UV. A hot, dry environment will dry out and kill the fungus so I've had the 300mm and my spare OM TC's baking in the oven for 36 hours.
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Old 26th June 2013
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Re: Fungus in lens

at what temps?
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Old 26th June 2013
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Re: Fungus in lens

Quote:
Originally Posted by David M View Post
Researching it seems the sunlight trick isn't an effective method, you can't generate enough heat or UV. A hot, dry environment will dry out and kill the fungus so I've had the 300mm and my spare OM TC's baking in the oven for 36 hours.
have they survived ? and are they clear of fungus now ?
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Old 26th June 2013
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Re: Fungus in lens

The fungus looks a lot better, a lot less visible and what is visible is translucent rather than white. I had the oven set on the lowest setting what ever that is.

It's not the first time I've had equipment in an oven, in the mid 80's I had an OM1, 24mm and 50mm submerged in Georgian Bay for 15 minutes. I used an oven at its lowest setting to dry the equipment out then.
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Old 26th June 2013
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Re: Fungus in lens

Quote:
Originally Posted by David M View Post
Researching it seems the sunlight trick isn't an effective method, you can't generate enough heat or UV.
Ordinary glass is pretty opaque to UV. I think 'fluorite' glass is used for UV work.

Jim
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Old 29th June 2013
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Re: Fungus in lens

I've now taken the 300mm out of the oven and replaced it with some of my other OM primes as a few of them seem to be showing early signs of fungus. I'll probably rotate all of them through the oven.
Then I'm going to divide them up. A few of them, mainly the macros, will be checked for fungus and if I can't see any kept with my HG and SHG glass. The rest will be used with my E-410 as my retro OM kit.
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Old 8th July 2013
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Re: Fungus in lens

I suspect the fungus is deliquescent; so whilst it may be less noticeable after drying in an oven the moisture will soon return.

I had a 50 mm f1.4 Zuiko stripped down for cleaning but it didn't do much good. The fungus etches the surface of the lens, so short of optical polishing it is impossible to restore the original clarity. The repair people also explained that the fungus often develops on lenses mounted in groups. These are difficult to separate, so there isn't a great deal that can be done.
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Old 8th July 2013
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Re: Fungus in lens

I think I've finally rounded up all my legacy glass so everything can be rotated through the oven.

The 300mm has been out of the oven for 10 days or so and the fungus is still translucent so hopefully baking the lens killed it. As it's been hot and humid a lot of the time since it came out of the oven it's been ideal conditions for it to start growing again.
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Old 8th July 2013
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Re: Fungus in lens

Having once lived in the tropics for a couple of years and having had a minor fungus issue I used to keep my camera (less film!) and lenses in a sealed plastic bag with a small piece of cotton-wool dampened with formaldehyde. This killed all the fungus and seemed to prevent any recurrence, it will however ruin any film in a camera. It's now considered carcinogenic and must be used under prescribed conditions so is difficult to obtain - you might find an undertaker or vet may part with a little, on ebay UK:

http://www.ebay.co.uk/itm/Preservati...item257a3f347e

It's good for eliminating the bugs in smelly trainers as well!

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Old 9th July 2013
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Re: Fungus in lens

ISTRC that fungi don't like sulphur, so I wonder if a small 'nub' kept in the lens bag would keep it at bay.

Jim
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Old 20th July 2013
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Re: Fungus in lens

Well it appears baking equipment in an oven isn't just a way of drying out equipment, so far it seems to be a way of dealing with fungus. The translucent remains that were still visible after it came out of the oven have now disappeared. I was out with the lens today looking for the Black Bear that destroyed a bear proof garbage can a few days ago.
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