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How to remove internal fungi on lens groups - Tamron 300/2.8 LD Lens

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Sorry, but it's impossible to do without major disassembly requiring special tools and skills. Reassembly also requires the lens to be collimated as the lens groups are being refitted..

If you get the work done professionally, it will far exceed the cost of a replacement lens.

In any case, there are various types of fungal attack. Some feed only on the lubricants and lens cements inside the lens and can be removed during disassembly, but unless all parts are irradiated the spores will re-grow very quickly. Other types of fungal attack actually damage the lens multicoatings and some fungi attack the adhesive between optical groupings. These cannot effectively be cleaned off without leaving permanent damage and once again there is the risk of re-infestation. It's for this reason alone that many lens repairers will not accept such lenses for repair and there is also a slight (but unproven) risk of cross infection from one lens to another.

One solution which seems to be effective with some lens fungi (in my experience at least) is to expose them to UV light. This is achieved simply by leaving the lens outside on a few dry days without the lens cap on. Direct sunlight is best avoided, and if the lens is under glass then it will take longer as even regular window panes block much of the UV from the sun.

Preventing lens fungus is the best solution of all: never store lenses away unless thoroughly dry, so if they've been exposed to moisture or have had condensation on them then leave them somewhere dry and well ventilated before storage. Silica gel sachets in the camera bag also help, but don't forget to change them periodically.

Although this is probably not the answer you hoped for it also means that you have absolutely nothing to lose by trying to dismantle your lens anyway if the UV method fails. If you can get to the fungi directly then acetone seems effective at removing it but can attack the structural components of the lens, so go easy with it. I cannot provide you with any useful schematics as they're all copyright material and not legally available for free in the public domain.

Good luck, I hope you manage to use this information to arrive at a decision about what to do with your lens. Please take a moment to rate the free answer I have provided for you and any testimonial which you might wish to add is always welcome!

Posted on Oct 02, 2010


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The success o cleaning fungus off a lens depends on how far the growth has gone.Light fungus on the outside surface off the lens can be removed by wiping a thin smear of Dove cream on the affected surface and then lightly removing using cotton buds. Follow this with a light polish using lens cleaning cloth. Never use cleaning tissue, it will scratch. A useful tip is to wash the lens cloth in hot water and dish washing liquid and rinse and ry before use. Have a spare clean cloth ready.
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there is no solution, your lenses are spoiled forever. The fungi are eating up the resins used to glue togheter the compound lenses. Clearly you are living in a hot and humid envinronment.
In these conditions you can only prevent the problem by storing the camera in a sealed container filled with drying salts ( you can buy them in any camera,s shops ).

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Contact Tamron USA via their web site or a phone call to get a price quote for the front lens assembly. However, I would strongly suggest that instead you allow Tamron to repair your lens since more than likely the internal roller glides have been compressed due to the impact. This would allow the front lens group to wobble a bit while focusing and zooming, and this would seriously affect the image quality.

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