>>3347973>>3347960>>3347701>>3347719While this depends on how the lens is designed, I highly recommend getting a spanner and screwdriver so you can take apart the lens just enough to get to the elements that have fungus and clean them. You can't kill fungus per se. It merely goes dormant in most cases. UV light does help, but it also causes fungus to branch out more than normal. "Dead" fungus is also a good place for more fungus to grow on.
If your lens is really expensive and you don't trust your own skills to do it correctly, it may be worth it to send it in to get it cleaned. If you do clean it yourself, take photos as you take it apart, and only dismantle it as much as you need to. A lot of times you merely need a spanner, to take off some rings and pop the elements out or unscrew a tube the elements are mounted in. The only tricky parts are if you unscrew/uncouple the focusing threads. If you do that, you can totally fuck things up and not get them back together or their threads can start disintegrating after a few tries to get it right. And, the other thing is keeping track of which side is which, on the glass elements, so when you replace them they are facing the correct direction. Using a marker you can make a ^ symbol on the side of the element showing the direction that points to the front of the lens when you first take it out.
I've cleaned several lenses of fungus and unlike what most people say, it wipes off super easily. The only times there is a problem is when the coating on the lens has itself turned hazy, which from what I've seen, isn't related to a fungus problem and can't be fixed.
If you live in a super humid place like I do, you are fighting fungus 24/7. Use 'rechargeable' silica gel packs and keep the lenses in plastic bags if humidity is really high. If I leave a lens out, on the table, fungus starts growing within few days. Such is life in a temperate rainforest.
Practice on $10, "FUNGUS for parts only," lenses first. Resell them.
