[pure-silver] Re: Battery for Mamiyaflex Porrofinder CdS
- From: Tim Daneliuk <tundra@xxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 9 Dec 2016 14:03:00 -0600
On 12/09/2016 01:48 PM, Richard Lahrson wrote:
Hi, looking further still, it seems the early Mamiyaflex Porrofinders
took the mercury 625 cells (the one I have) and later models took
the S76 silver oxide, why the fellow said the battery cover had
S76 marked. I'll just get a Wein air cell replacement.
Rich
I STRONGLY recommend against the Weins. They have a very short shelf life
and are super expensive. If you plan to use the finder a lot, the CRIS
solution is the best in my experience.
There is one other possible approach. It's not important that a meter be
accurate, only that it be consistent. You could use an S76 and compare
the Porrofinder readings against a know good meter. In all probability -
if the Porrofinder is still calibrated for 1.35 volt battery - is going
to give you exposure indications that are 1-2 stops UNDER what they should
be. That's easy enough to deal with so long as the Porrofinder does
this consistently for dark and light subjects - just crank down the ASA
accordingly. Suppose you discover that the meter reads 1 stop low with
an S76. Then just set ASA to 1/2 of what it normally would be. So, if the
real ASA is 100, set the meter to 50. Problem solved.
Again, for regular use, I prefer the CRIS solution.
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