Re: [APML]: Dew caps for camera lenses

[Mike Downey <mike@mjd.u-net.com>]

At 13:44 24/08/96 +0100, you wrote:
>
>What does one use to prevent dew from forming on camera lenses?  Thanks.
>
>

I do most of my astrophotography in Anglesey, North Wales, and dew is a
really big problem. Some nights, the lens can be completely covered in
around 5 minutes! I have a 10 minute exposure of star trails, where each
star looks like a mini comet, with a bright area that fades to nothing after
a few cm.
After that, I made a cone out of stiff cardboard, and lined it with dark
absorbent paper. This is usually enough to keep the lens clear for a couple
of hours.

  -- Mike

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Mike Downey                    mike@mjd.u-net.com
               http://www.personal.u-net.com/~mjd
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