[rollei_list] Re: Hearing Aid Batteries in Nikon F
- From: stephen@xxxxxxxxxxxxxxxxxx
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 03 Mar 2010 23:07:31 +0000
I notice about a 1/3 stop difference between a discharged silver cell and a
'full' one in my converted Nikkormat. Solution: replace the silver cell before
using the camera for critical work.
While folks in the late 90s got into differences of 1/6 of a stop with their
digital wonder meters, the old Modern and Pop Photo magazines in the Oakland
Public library used +- 1/2 stop from a reference light source as their
standard. A bit of tolerance certainly makes life a bit easier...
...and which of you keep a shutter speed tester, measure your actual shutter
speeds and keep them on a card in your camera case for reference? (I believe
Bill Pierce used to do that with his Leicas). As I recall, the tolerance for
mechanical shutters was 1/3 of a stop, 1/2 stop for the highest two speeds.
-----Original Message-----
From: Marc James Small [mailto:marcsmall@xxxxxxxxxxx]
Sent: Wednesday, March 3, 2010 04:03 AM
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: Hearing Aid Batteries in Nikon F
At 02:50 AM 3/3/2010, you wrote: > I am not sure whether silver oxide cells
have as flat a >voltage characteristic as zinc air cells. It is the >constancy
of voltage which is important. Well, yes and no. In VERY general terms,
European cameras used a voltage regulation circuit -- camera folks often use
the term, "compensated circuitry" -- while Jap cameras relied on the known
abilities of the mercury cell. But then, what level of accuracy are you
seeking? Bob Shell insisted on 1/6 stop accuracy, just before he went over to
the Dark Side of digital. Marc msmall@xxxxxxxxxxxx Cha robh bàs fir gun ghràs
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