alfbranch
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I agree.A lens which 'trombones' like the 12-40 has to allow air in and out through a venting system in the camera body. If it didn’t moisture would enter much more easily through any sealing system in the lens itself.
It's likely that the air that condensed had entered the lens in this way. Then it’s down to the relative temperature of the lens components and the amount of moisture content (and temperature) of the atmosphere in the lens.
So I wouldn’t be surprised if this didn’t happen to any lens on the odd occasion depending on the factors mentioned above. Of course if a lens doesn’t employ good weather sealing, which Oly Pro glass does, then it’s a more likely occurrence.
Anyway, I hope you get it resolved to your satisfaction.
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