[rollei_list] Re: Meters and Film
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 3 Sep 2009 13:23:33 -0700
----- Original Message -----
From: "Carlos Manuel Freaza" <cmfreaza@xxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, September 03, 2009 12:20 PM
Subject: [rollei_list] Re: Meters and Film
Thank you Richard, however my camera received an excellent
CLA by Harry and I don't think a mechanical issue could be
the problem, the meter needle moves vividly reacting to the
light but measurements are wrong most of the times, the
readings are low and then you overexpose, I think I need new
cells, anyway this is not a serious problem to me.
Carlos
It could still have a contact problem despite Harry's
ministrations. Its worth at least removing the meter and
cleaning the contacts. When cells go bad they start by
becoming non-linear as I posted earlier. If the meter is
wrong all over its likely to be something other than the
cell especially if the error is constant at all light
levels. If the meter is accurate for low light levels _at
the cell_ but has an error for high light levels, its likely
the cell. Very old cells become inactive or nearly so. As an
example, I have a very early Weston (probably about 1937)
which hardly reads at all. Ive checked this one for wiring
or contact problems. Another Weston of about the same age
seems to be perfectly accurate. I also have about four
General Electric meters of both the PR-1 and earlier
version, all have bad cells. One of the PR-1s has gone bad
in the last year. I also have an original Norwood Director
with a bad cell. All have about the same symptoms. I think
the fact that some old meters survive is a matter of the
history of the meter or, perhaps, manufacturing variations.
After all all these guys are sixty years old at minimum.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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