[rollei_list] Re: OT: Selenium Meters
- From: Marc James Small <msmall@xxxxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 21 Apr 2006 16:42:20 -0400
At 07:09 PM 4/21/06 +0000, Carlos Manuel Freaza wrote:
>The problem with selenium meters is that the cells
>lose sensitivity along the years due to exposure to
>light and dust becoming dead finally, the quation is
>not if they'll die, the question is when, however
>there are old selenium meters in good condition tilll
>today, i.e. my 3.5F lightmeter is in good condition
>yet.
I geg to dissent on this, Carlos. You are correct to point out that
physical leakage will cause a system failure but most selenium cells were
properly sealed at least after the First World War. Almost all failures
are caused by breakage in the rather intricate mechanical linkages these
meters require. I have some 1930's selenium meters which still function
properly, and several others which were broken when I purchased them --
such as my Metrawatt LC60 Leicameter -- but which only required attendance
to the mechanics, the cell itself still being good. For that matter, the
cell on my father's Weston 715, from 1938, is still functional and
accurate, though the mechanicals have required George Milton's attention on
one occasion.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
NEW FAX NUMBER: +540-343-8505
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