Re: *fast* film/Hale Bopp

[P3D Sam Smith <3dhacker@xxxxxxxxxxxxx>]

>> However, what really bothers me is the idea of getting a stereo
>> picture of a comet using a slide bar. Astronomical objects are
>> just too far away. I'm sticking to 2-D for Hale-Bopp.
>
>The comet does move relative to the stars.  Right now around a full moon
>is a tricky time to photograph because the reflected light from the moon
>takes a large non-linear swing about the time of full moon.  But if you
>wait say a few days to a week, you could try shooting the comet on
>sucessive nights at about the same time (to match illumination
>conditions).  Then you just have to line the stars up so they appear to
>be at infinity.  The comet won't be :-).  As the moon wanes further, you
>can cut this to a few hours on the same night to bracket the time span
>(ie baseline) a little more.
>

I did this for Hyakutake. Amazingly enough, 1 1/2 hours between exposures
was all that was required to produce apparent depth. I'm not aware of the
speed Hale-Bopp is traveling across the skyline. Anyone know how it compares
to Hyakutake?


Sam


------------------------------