[rollei_list] OT: Replacing Mercury Cells in a Nikon F
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sat, 3 May 2008 18:20:22 -0700
The mercury cells in my Nikon F finder finally died and
I can get no more. I tried an experiment which works and may
be of interest to others since it may work on other devices
which use type 625A cells.
The voltage of size 675 zink-air hearing aid betteries
is correct, very nearly the same as the mercury cells. The
physical size is wrong. My solution is a bit of a makeshift
but seems to work. I used rubber O rings to build up the
outer diameter. In the Nikon finder the positive connection
for the cell is a small contact at the side of the battery
compartment. In order to make contact with it I wrapped a
small bit of aluminum foil around the O ring before pushing
it onto the cell. It is held against the cell by the O ring
and against the contact by the other side of the O ring,
which is a slightly tight fit in the compartment.
With the two cells in place the test position of the
meter reads right on the dot and a test against a Sekonic
meter indicates the reading is as close to being identical
as I can read. Undoubtedly the life of the ZA cells is much
shorter than the mercury cells but they are cheap and easy
to find (got mine at Radio Shack) and keep the equipment
working.
The cells in my Luna-Pro are about the same age and will
probably also need replacment. I will report later whether
the same expedient works for it.
I know there are all sorts of adaptors available but
this is something I could do in a few minutes with materials
at hand.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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