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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 |