Hi Jim:
Thanks
Gord
----- Original Message -----
From: "Jim Brokaw"
> Selenium cells respond to light falling on the surface, more light = more
> current generated. In low light levels, below a certain threshold there
> isn't enough current to move the meter needle... add more cell area and
more
> current is generated, but a built-in meter only has so much area to use
for
> cell, so add-on cells were a technology used some to boost sensitivity.
> Typically you'd use a different index mark on the calculator dial when
using
> the booster cell. Leica made a booster cell for the early selenium Leica
> meter, since the meter alone was small to mount tidily on the flash shoe.
> Almost all these old cells are 'dead' now, the selenium loses electrical
> generating ability after decades and light exposure.
> --
>
> Jim Brokaw
> OM-'s of all sorts, and no OM-oney...
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