Fungus can be a problem with older cameras and lenses, especially if they’re stored improperly. To keep your equipment as fungus-free as possible, always keep it in a dry location, wipe off any moisture (ocean spray, mist, rain) immediately, and consider keeping a
desiccant (a drying agent) such as silica gel in your camera bag to absorb any excess dampness. MoistureMuncher capsules, from underwater photography company
SeaLife, soak up humidity and even turn pink when it’s time to change them out. If your lens already has fungus, take it to an expert to be cleaned. Do not attempt to take a lens apart yourself.