Hi Leon,
The flash, which is made from a Polaroid unit and
a single straight flash tube about 50mm long,
works very well as a flash. But the tube, which
lies across the beam, causes diffraction in the
images. In other words it doesn't work very well
in the microscope. I intend to use a beam splitter
and direct light from a standard flash into the
path. I may even be able to use TTL if I can find
a connector that will satisfy the camera. So the
problem now becomes -- "How can I trigger the
Vivitar on the table about 24" away from the
camera and what extension lead do I need?" The
camera is on the top of a monocular mount behind
the binocular and using one flash to trigger
another would be very dangerous and unstable. I
can imagine the camera up on top of this 'Xmas
Tree' with a flash in the shoe. Something would
give very soon. It would get in the way of my head
in any case.
Don
Leon Altoff wrote:
Don,
The flash on the microscope may have too high a voltage for the ist D.
Once it flashes it may be locking up the camera. Try measuring the
voltage or disconnecting the flash flash after each exposure. You may
not want to keep doing this too often in case it permanently damages the
camera.
A solution to this could be using a slave unit on the microscope and
triggering it with the Vivitar flash.
Leon
http://www.bluering.org.au
http://www.bluering.org.au/leon
Don Williams wrote:
Hi all,
I'm still waiting for the replacement camera and am using the one with
the faulty internal flash. It works with an external flash Vivitar 730
AFPK perfectly ... but.
On the microscope, which has a simple flash device with no
synchronization, or TTL, or anything at all automatic ... the flash
will flash once and then not again. Its not a question of charge the
flash is made to strobe and will go on flashing with a film camera
until the cows come home at 1/2 second intervals.
What am I doing wrong? I haven't spent much time learning -- I've been
using the camera and it works fine with ordinary lighting on the
scopes. In green, M, or any other setting I might like to use. All I
want is for the flash to flash each time the shutter is opened. The
exposure is controlled by other means and the camera is not expected
to think about this.
Don
--
Dr E D F Williams
__________________________________
http://www.kolumbus.fi/mimosa/index.htm
http://personal.inet.fi/cool/don.williams
See feature: The Cement Company from Hell
Updated: Added Print Gallery - 16 11 2005
