Hi R. Lee Hawkins:
If you had some walkie-talkies or some cb radios you might try to
use an SCR (silicon controlled rectifier) of the type available
at Radio Shack (#276-1067) or GE-C123B1 for about two dollars.
There is a book by Dan Lewis (1990)Library of Congress Catalog
Number 90-70088 that describes using this with
a motor winder for remote controlled release of the shutter. I used
this once with a tape recorder and microphone to have sound triggered
exposures.
I think this would work as a flash trigger using a "PC" connector
from the OM's flash sync PC socket, but you would need one on the
camera and one on the flash and some slave units to trigger other
flash units.
If there were a telephone in the observatory dome perhaps you could
connect the telephone through the SCR to a flash units and put a
cell phone with an SCR on the camera side.
Anyway, I think it is a great idea and it would be really fun to
take some photos this way.
R. Lee Hawkins wrote:
>
> Hi all:
> Recently I've been taking pics of our observatory from the roof of the
> adjacent science center, in order to get some "bird'-eye-view" shots.
> I'm doing this with the domes open and the telescopes pointed toward my
> camera, and with the 1000mm (500/8 + 2x-A) and 500mm shots I'm spot
> metering in and outside the dome (inside the domes is dark, the outside
> is bright white).
>
> Now, it'd be nice to have some radio-controlled flashes that would go
> off when I fired my camera from the roof. I've calculated the one-way
> light travel time, and it is ~100x shorter than a 1/1000 sec flash
> duration. These wouldn't need to be TTL flash, since all they would be
> doing is lighting up the interior of the dome while the shutter is open.
> I could play around with apertures to get the exposure right.
>
> So... does this sound totally silly? Anyone done anything like it
> before? Anyone know how cheap radio controlled flash triggers are?
> (I've got a slew of T-20's and a T-32 I can use for this project).
>
> Thanks in advance!
>
> Cheers,
> --Lee
> ________________________________________________________________________
> R. Lee Hawkins lhawkins@xxxxxxxxxxxxxxxxxxx
> Department of Astronomy lhawkins@xxxxxxxxxxxxx
> Whitin Observatory http://www.astro.wellesley.edu/lhawkins/lee.html
> Wellesley College Ph. 781-283-2708
> Wellesley, MA 02181 FAX 781-283-3667
> ________________________________________________________________________
>
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