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From: "Roger Lascelles"
Subject: Re: Se Photocell "exhausted"?
Date: Tue, 24 Dec 2002 20:10:10 +1100
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
My Father's 65 year old Weston meter is still working and the calibration
hasn't drifted noticably in 60 odd years - it is still 2 f-stops low as
"J. Hill" wrote in message
> I have an old Weston lightmeter. It uses a Selenium (Se) photocell, and
> it does not need a battery. The meter isn't working, and in a
> photography forum someone said that the Selenium cell becomes "exhausted."
> I find this explanation unlikely because my understanding of the way
> photocells work tells me that the photoelectric effect is a property of
> the element Selenium. If the selenium is exhausted, where did the
> photoelectric effect go to? Has the Selenium transmuted into another
> Most importantly, if the Selenium really is "exhausted," is there a way
> to "revitalize" it? A dunking in Geritol, perhaps? :)
> Thanks in advance for your assistance.
> - Jim
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