On Jul 29, 2004, at 6:26 PM, Jinx wrote:

> There is no way I'd believe
> the human eye can react to a microsecond flash as fast as a camera
>
Most cheap xenon camera flashes are MUCH longer than a microsecond.
IIRC, most are around a millisecond.

>
> Flash/strobe - same thing ?
>
We seem to be using "strobe" to be stroboscope, as in multiple flashes
per image, for stop-motion analysis and such.  Xenon strobes that do
100 flashes per second or more are pretty rare, I think; LEDs would be
able to do much better.  Depending on how fast the phosphors are.
(OTOH, for some applicationsyou might not need phosphors; CCDs being
sensitive to IR and so on...)

There are applications where a xenon flash is TOO bright, and a slower,
dimmer flash would be preferred if it were technically feasible.  Macro
photography comes to mind (and a ring of LEDs is much easier and
cheaper to implement than a ring shaped xenon tube, too.)  Even
portraits might benefit; LEDs are theoretically color-temperature
tunable, too...

BillW

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