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.
>
Haven´t you tried slave flash trigger? I know they work opticaly, but
with a strong flash it would be posible to triger them from a distance
and at daylight.
Richard
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