On Thu, 29 Jul 1999, Giles wrote:
>>Does 3500 mean a guide number of 35(m) at ISO 100?...and what is a
>>"Thyristor"??!
>
>I don't have any technical knowledge of thyristor circuitry, but it means
>in crude terms that there is something like a capacitor that prevents you
>from burning your batteries all the time that the flash is turned on. You
>may see the ready light go from red to green. Red means it's ready to fire
>but still on battery; green means it's also ready to fire but not burning
>batteries at the moment.
As I understand it (and don't hold me to it!), Thrystor circuitry is a
battery saving thing. When in auto mode, say the subject reflects back
enough light for proper exposure. A little hole cum sensor at the front of
the flash collects reflected light, and when it thinks you've got enough,
it quenches the flash burn. Now, in addition to that, it /saves/ the
unused charge in the capacitor, instead of wasting it. In effect, think of
it in terms of you putting out a fire with buckets of water. Once the fire
it out, the "thrystor person" stops throwing the leftover water, instead
of completely emptying the tank. Hope this makes some sense. Best,
/Acer Victoria
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