P3D Re: Shooting Fireworks

["Dr. George A. Themelis" <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

>When using these extended separations (8ft - 30ft) would you "toe
>in" the cameras? If you did "toe in" how did you determine the
>angle to use and what method to actually place the cameras at
>that angle?

I think the widest I have used is 6 ft and I usually have the lens'
axes parallel (no toe-in).  If you shoot full frame 35 mm slides
then there is enough space to mount them in a 7p mount and keep
a good stereo window.  Most people will converge the axes at
the point of interest (and I do that when I shoot hyperstereo
and follow my object with the camera on a moving platform).
   
>> Regarding exposure, I used 50 ASA film and f11.
>What length of exposure did you use?

>From a few seconds to as long as 30 seconds maybe.  If the fireworks
had distinct trajectories, time should not be a factor but at long
exposures many of them will overlap so one could adjust exposure
(use an even smaller aperture) at very long exposure times.

-- George Themelis


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