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.
The smaller the size of the piece of selenium the less sensitive the
meter to low light.
Using a battery allows amplification and shrinks the size of the sensor
required. Without that development you couldn't have had TTL.
Chuck Norcutt
Leandro DUTRA wrote:
> 2008/4/4, Gordon Ross <gordross@xxxxxxx>:
>> whatever happened to selenium metering- probably sabotaged by the
>> battery consortium.
>
> That's a story I would like to hear.
>
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