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Old Wednesday 13th November 2019, 20:42   #12
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Join Date: Dec 2017
Location: Cologne, Germany
Posts: 348
Condensation on the exterior lenses occurs frequently when one returns from a cold environment to a warm environment. Even after it has evaporated it still sometimes leaves visible traces.

In winter I put the tethered objective covers back on my bins and after a birding session cover up the objectives and the eyepieces (with the rainguard) before coming back indoors.

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