At 10:34 PM 7/12/03, Johnnie wrote:
All images were shot with a -4T, on Provia 100F at f11.
[snip]
The images seem to lean toward the red spectrum. I seem to recall the
show having a lot more blue and green that I captured. My guess is
that those colors weren't bright enough to show up well on the image.
Would the lenght of the exposure make the images go red?
Johnnie,
The exposure time you used shouldn't have resulted in any color shift, at
least due to using long exposures. According to Fuji's data sheet for
Provia 100F, reciprocity failure doesn't kick in until exposure time
exceeds 128 seconds. At four minutes, Fuji recommends a specific "green"
filter and adding 1/3rd stop compensation.
I'm thinking you may have underexposed them by 1/2 to a full stop. With
Kodachrome 64, Kodak E100S, Fuji Provia 100F, and Fuji Reala (ISO 100) I
use f/8 with exposures ranging from two to eight seconds . . . depending on
how rapidly the rockets are being launched.
Aerial fireworks exposure is determined much more by aperture than by how
long the shutter is open. The "shutter speed" for the air bursts is
effectively how long the burst burns in the sky. If you keep the shutter
open too long, the sky will begin to gray out; that's the primary reason
for limiting it.
-- John
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