17/03/2026
Fungus in a lens
How does a fungus grow in a lens?
Fungus is a parasitic spore that travels in the air and can enter and settle inside cameras and lenses, which are not airtight. Its growth is encouraged by humidity, high temperatures, and environments that are dark and unventilated.
How can I prevent fungus from growing in my lens?
The possibility of fungus growth can be minimized by storing the equipment in well-lit and well-ventilated environments with moderate temperatures and low humidity. We recommend removing equipment from carrying cases during storage and not storing cameras or lenses with clothing.
Should fungus growth occur what is required to be done to repair/clean the lens?
In general, Camera & Lens Service Technicians can clean fungus from lenses if the growth hasn't become well-established. There is no set repair price because sometimes only a simple external cleaning will do the job. However, internal fungus growth requires disassembly and possibly the replacement of some parts. Additionally, since fungus secretes acids that can etch glass, a lens element may be ruined even if the fungus itself can be cleaned away. The only solution for this is to replace the element, which can be expensive.
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