Re: Fireworks ?

[phil <filje@xxxxxxxxxxx>]

zxiong@xxxxxxxxxxxxxxxxxxxxxx wrote:
> 
> >Any documentation on slit panorama flash photography?
> 
> There is no slit panorama flash photography, period.
> 
> Flash normally happens under 1/1000 sec.  For a camera to synchronize with
> the flash the shutter must be fully open when the flash is on. This is possible
> for all leaf-shutters, partly possible for focal plan shutters and technically
> impossible for slit shutters.  Focal plan shutters use narrower openings for
> speeds higher than, say 1/250 s. If I remember correctly, 1/250 s is the highest
> flash-able speed for the XPAN which uses a vertical focal plan shutter.  For
> Noblex and other slit drum cameras with the highest drum speed 1/500 s, using
> a flash is not possible unless the flash is on during the entire drum run.
> 
> Zonghou Xiong

On the contrary!
I came very close to accomplishing this feat last year when I was bored.
the rotational speed of the drum on a Horizon was calculated at
1/5s on fast and 5 sec on slow. Then you figure out how wide the
slit is at whichever speed with a caliper or ruler.
then you figure out how many slits widths in the length of time
it takes the drum to rotate. Then you have a digital timer with 
auto-reset to continually trigger a powered down studio flash or
thyristor flash. The test film came out with very very narrow overlaps.


Phil
Phillip Geller Photography

controlled on camera flash.