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Hi
Alson,
I've
captured good Leonid shots using 20mm, 35mm and 55mm lenses; all on an
equatorial mount; with 5 minute exposures; P1600 at ISO 1600; f/4 (basically
stopping each lens down 1 stop).
Scott
website: http://www.rsiphotos.com/
email: ireland@gate.net
I'm planning to shoot the Leonids with a 50/1.8 lens and a
wide-angle lens (28/2.8 or 20/2.8) using Ektachrome P1600 on an equatorial
mount. Generally, the advice for meteor photography is to use the lens
wide open and a fast film, but given the film's high reciprocity failure,
stopping down the lens will allow me to triple the exposure time (calculated
using Covington's exposure program) before running into sky fog along
with providing sharper stars. A similar effect applies for developing
the film at ISO 800 instead of 1600. What is the best combination of
film speed and f-ratio, keeping in mind the high reciprocity
failure?
--
Alson Wong
Riverside Astronomical
Society
http://www.rivastro.org/
Visit my Web
page at:
http://home.earthlink.net/~alsonwong/index.htm
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