Andy,
The length of the DSLR shutter setting isn't important as long as the
1/4 second auxiliary shutter operates within its open window. The
DSLR shutter speed could be set to anything greater than 1/4 second.
Correct? Two seconds is a long time. Did you trigger the auxiliary
shutter manually?
I'm not familiar with your simple electronic inverter switch, but can
you rig it to vary the time of firing within the 1/4 second window?
Could you fire the flash more than once during the 1/4 second open
duration?
Unrelated question: Does this DSLR use an actual mechanical shutter?
Or is it done electronically by setting the capture time from the chip
within?
Roger
On 18 Mar 2009, at 7:46 PM, ADavidhazy wrote:
This evening I did a presentation/demo on what is often called rear-
sync flash,
or 2nd curtain sync or, as I prefer calling it, tailflash sync. The
live demo
was done using a standard DSLR that did not have such a capability.
So I added
a Copal leaf shutter to the front of a DSLR lens and using a
"simple" electronic
inverter switch between the shutter and the flash fired the flash as
the Copal
leaf shutter started to close instead of as it first fully opens ...
X sync.
I was able to demonstrate the effect of putting the blur (due to
longish shutter
exposure time recording tungsten illumination) on the side of the
moving
subject from whence (!) it was coming from while the flash provided
the action
stopping burst to record a blur-free image of the moving (walking)
subject.
The DSLR's exposure time was set to 2 seconds and within that time
the Copal
shutter operated for 1/4 second. To see the camera with attached
Copal shutter
follow this link: http://people.rit.edu/andpph/a-pix/leaf-shutter-dslr-7891A.jpg
Now I am trying to think of other applications for a DSLR avec leaf
shutter up
front. Suggestions? ;)
andy
