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

Started Jan 18, 2013 | Discussions thread
photonius Veteran Member • Posts: 6,895
Re: AirCon issues

Steve Balcombe wrote:

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.

Right, one should know all things into consideration. In my case, the lens where I had condensation on was the Canon 10-22. So I was actually happy in this case to have a filter on it. The condensation started on the filter, rather than on the the inner barrel with the front lens, which moves within the outer barrel. Otherwise condensation could have entered the lens. So at least the front was sealed on that side, until I noticed the issue, and solved it by letting the camera warm up.

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