Same problem with telescopes. Sometimes a hood will help. And
telescopes users sometimes use an electric heater band to gently heat
the end of the scope to prevent condensation. Anything you can do to
keep the temperature of the lens above the dewpoint will do it.
Winsor
Long Beach, California, USA
On Nov 7, 2005, at 1:24 PM, Komtanoo Pinpimai wrote:
> I tried to shoot stars last night and the problem that occured is
> humidity. After 10 minutes, outside my OM lens turned to be dewy. I
> think it's a very common problem, since every night in fall season,
> the humidity is high, I wonder how they overcome it ?
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