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Inner fungal bloom issue, 6 month old Canon ef 70-300 L

Started Jan 18, 2013 | Discussions thread
nelsonal Senior Member • Posts: 2,464
Re: Inner fungal bloom issue, 6 month old Canon ef 70-300 L

Depending on the intensity a couple hours should kill it off.  Generally sunlight is intense enough over a few hours to do the job, so with UV bulbs much closer I would think any exposure would help but an hour should more than do the job (it won't, unfortunately, keep reinfection from happening).

If it's just on that first element, it would normally be under an hour to do the job (and I'm including time for me to figure out how the lens should be disassembled), so with overhead I would expect something on order of $100 in the US (googling reveals estimates of $50-$150 depending on severity).  I would expect that you could find more repair options for this issue in the tropics but I could be quite wrong about that.

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