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Re: (meteorobs) Question - Photographed Meteors
In a message dated 97-08-05 14:51:16 EDT, you write:
<<
> From: GeoZay@aol.com
> Well...I just developed my first roll of film that covered 4 nights of
> observing meteors this past week. I used a 28mm lens at f/2.8, a rotating
> shutter and guided.
Gregg>>George, what ASA (ISO) was the film, and what was your exposure
length? I'm planning on taking guided pictures for the first time
for this year's Perseids, if I can get the machining finished for my
barn-door drive. In the past I've taken unguided pictures with ASA
1600 film at an exposure length of 5-10 minutes. I seem to average
2-3 meteors per 36 exposures.<<
Gregg...I use black and white film HP-5 and develop it for ASA 3200. My
exposure times is approximately near 30 minutes per frame...unless I get an
apparent bright meteor within my camera's field of view....that is a -1 or
brighter....then I try to stop it with an exposure of about 15 or 20
minutes...this usually gives me very good pinpoint star images. If a bright
meteor appears between the 15 and 30 minute period of the exposure....I try
to stop it as soon as I can.
I don't use a barn door drive...I have a battery powered gizmo that tracks
quite nicely without much attention...except for quick polar alignment after
each exposure...which is simple to do.
George
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