2008/4/4, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>:
> Selenium is photo-voltaic meaning it generates a voltage on its own with
> enough power to drive a meter without a battery. However, the output
> power is proportional to the size of the piece of selenium and it
> requires a pretty large chunk to move the needle on an exposure meter.
Thus the translucent circle around Pen EE lenses?
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