[rollei_list] Re: Batteries
- From: "Austin Franklin" <austin.franklin@xxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Fri, 6 Nov 2009 10:23:41 -0500
Hi Eric,
You make a somewhat funny point that I hadn't thought of. I have checked
the F1 meter using mercury vs higher voltage SO against each other for
accuracy, and found what I stated. But, I don't believe I specifically
checked the accuracy of the original mercury batteries against, say, a
Gossen LunaPro, during the same testing. Or, perhaps I did, and don't
remember...but I can't say for sure. But, I have tested my F-1s at at least
three points in the metering range while I calibrate them (I still have a
supply of mercury batteries, so that's what I use), and the readings were
reasonably accurate.
Regards,
Austin
> -----Original Message-----
> From: rollei_list-bounce@xxxxxxxxxxxxx
> [mailto:rollei_list-bounce@xxxxxxxxxxxxx]On Behalf Of Eric Goldstein
> Sent: Friday, November 06, 2009 10:07 AM
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] Re: Batteries
>
>
> I have had the same experience and agree with this. However my own
> tests of some of the older camera meters (such as on the F1, FTBn,
> several Konica rangefinders, etc) with NOS refrigerated mercury
> batteries revealed them inaccurate through a good part of the range
> with the original cells. So much of this is the nature of the beast
> with old technology meters and not compensating for the voltage
> issue...
>
>
> Eric Goldstein
>
> --
>
> On Fri, Nov 6, 2009 at 9:54 AM, Austin Franklin
> <austin.franklin@xxxxxxxxxxx> wrote:
>
> > I have come to the same conclusion about ZO batteries. I won't
> use them.
> > But, I have found that simply "recalibrating" (which means
> different things)
> > to a higher voltage battery does not always yield the "correct" results
> > across the entire exposure range.
> >
> > What is typically done with "recalibrating" is simply adjusting
> the metering
> > system (via mechanical means or some electronic means) for the
> difference in
> > voltage "offset" at one point in the metering range. This may
> or may not
> > work for a particular camera. For the Canon F1 for example, it
> does not.
> > It may be close enough for most of the range though. And the
> Canon F1 is a
> > mechanical "recalibration". What I've found, is for mechanical
> > recalibration, there is always significant error for a good part of the
> > range, typically the ends if you calibrate for the middle. For
> electronic
> > recalibration, that is very dependant on the circuitry, and it stands a
> > better chance of higher accuracy across the entire range than a
> mechanical
> > recalibration.
> >
> > Let's not confuse accuracy with consistency. Even if a meter
> is inaccurate,
> > it can still be consistent.
> >
> > Some cameras, like the Canon EF, are simply plug and play. The
> circuitry
> > has a wider tolerance for input voltage (some claim it has a voltage
> > regulator, but there is no proof of that, and I have the schematics and
> > circuit boards etc., and find no regulator, unless it is
> embedded in the one
> > IC in the circuit, which I doubt), and the meter readings are
> the same for
> > mercury or silver oxide, with no adjustment.
> >
> > Regards,
> >
> > Austin
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