The spectral curves published
by Kodak on this emulsion show a very strong peak at 650nm, very
close to that of Hydrogen Alpha emissions. The goal of these
tests was to prove if there was any meaning to these curves as
far as sky photography is concerned. As seen , especially in
the bottom frame the sensitivity is very much there, and the
colors and contrast are excellent. Although the film is not quite
as contrasty in Ha as such films as E200 or Provia 400, it is
a negative film with 2 stops more dynamic range and an impressive
speed to grain ratio. The key seems to be the ratio to the other
two peaks. In this case, the red layer peak is the same height
as the G and B layers, and the contrast is normal. In E200, and
Supra 400 by comparison, the red peak is higher than the other
two. None the less, the performance of this film along with its
speed is very noteworthy. The grain is not miniscule, but acceptable
in light of the very fast nature of t his film for sky shooting.
It is perfect for new skyshooters to test their equipment, and
hone their skills for someday more advanced shooting. Below is
a tally of exposure times at a dark site for this film with different
focal ratios:
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