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

Started Jan 18, 2013 | Discussions thread
Steve Balcombe Forum Pro • Posts: 15,582
Re: Inner fungal bloom issue, 6 month old Canon ef 70-300 L
1

The 70-300L is weatherproof, but not fully waterproof and certainly not airtight. Also it's only weatherproof when mounted on a body - the rear is completely open. If you're working in a very humid environment you need to take appropriate precautions, even with a weatherproof lens.

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