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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: AirCon issues

photonius wrote:

Using a filter may have made things worse for the front lens, since you may have trapped most air in there. Put the filter on in dry conditions.

It certainly won't have helped. But also the 70-300L is one of the first lenses to have Canon's fluorine coating, which is incredibly effective in repelling marks, dust and water. Adding a filter simply deprives the lens of all the benefits of this coating.

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