At 09:29 AM 7/14/03, tOM wrote:
The exposure time depends on the time the light lasts. Even in a 1-hour
exposure, each bright trail would last only 2-5 seconds.
My experience is most are 2-3 seconds . . . perhaps some burn a little
longer. In any event, it is the effective shutter speed other than
background. I haven't deliberately underexposed Provia, so my thought was
using f/11 for ISO 100 film versus the f/8 aperture I've used successfully
in the past may have caused or contributed to the red shift. Otherwise,
Johnnie has some decent fireworks shots and much better than the vast
majority do the first time out.
For capturing meteors, a film with a lot of reciprocity failure is
preferred to
keep the sky dark!
The challenge with fireworks is the usual proximity to an urban area with
its attendant light pollution . . . even a mile or so near a medium city is
enough to destroy "dark sky" . . . along with smoke that builds up as the
show progresses. If there's very calm air the smoke can become
severe. July 4th celebrations can also suffer from high heat and humidity
that adds a "heat haze." It all conspires to leave the sky something less
than deep black.
-- John
tOM---- Abacurial Information Management Consultants ----
Tom A. Trottier, President http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
N45.412 W75.714 +1 613 860-6633 fax:+1-270-596-1042
"They that can give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety."
-- Benjamin Franklin
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