Weather sealing on the rear end of a lens

Started 5 months ago | Questions thread
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Beserk
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Weather sealing on the rear end of a lens
5 months ago

So I was cleaning lenses the other day and blew on the Canon 24-70 F/4L IS. I see it has a rubber gasket to seal itself against the camera, but I was surprised when I blew on the rear glass that it fogged up from the inside... Is there a problem with the lens? It also seems that there's a piece or two of dust on the inside of the lensĀ 

Comments please.  Thanks in advance.

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