Some time ago I read an article on how to photograph a .22 bullet going
through a balloon, light bulb, etc. It was done in a fairly dark room, a
camera with the shutter open on Bulb and a low power standard flash (with a
flash duration of about 1/30,000 second). The key was using a cheap
microphone to send a signal to trigger the flash. You had to experiment a
bit to coordinate the time of the sound reaching the microphone and the
bullet reaching the target (or better yet, just having gone through the
target).
On Tue, Dec 22, 2009 at 9:19 AM, Rand E <rtomcala@xxxxxxxxxxx> wrote:
> I don't think that mortars have anything other than a fixed firing pin
> at the bottom of the tube. Nothing like a trigger mechanism, just a
> fixed pin.
> If not a high speed camera, I think that it would take a lot of luck and
> many expensive mortar rounds expended the get this shot just right.
>
> Mark Marr-Lyon wrote:
> > I would guess that the shutter lag of whatever camera was used would
> > be too slow to trigger off the mortar round firing. The picture was
> > likely taken only a few milliseconds after the mortar was triggered,
> > so you would have to pre-trigger the camera to catch the round. For
> > this picture, I would also guess that the operators of the mortar
> > would not be willing and/or able to attach some sort of timing device
> > to trigger the camera at the proper time. If it were me taking the
> > picture, my first try would be to get as high of a shutter speed as I
> > could, set the motor drive as fast as it will go, start shooting when
> > they either drop the round in the tube or are about to pull the
> > trigger, and hope.
> >
> > Mark
> >
> > On Tue, Dec 22, 2009 at 6:03 AM, John Hudson <OM4T@xxxxxxxxxxx> wrote:
> >
> >> Assuming that the camera was a film camera I think it is doubtful that
> the
> >> photographer used his finger to trigger the shutter! The chances of
> getting
> >> the image just right as the projectile left the firing tube would be
> >> incredibly long odds.
> >>
> >> Isn't it more likely that there were a sound or light activated trigger
> >> mechanism attached to the camera ?
> >>
> >> jh
> >>
> >>
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