On Sun, 23 Nov 2008 23:37:16 -0600, James Waldby wrote:

On Mon, 24 Nov 2008 03:39:10 +0000, DoN. Nichols wrote:
On 2008-11-23, Christopher Tidy ... wrote:
True, but the F2 only keeps the battery in the body in order to make
the prism more compact. The metering is still in the prism. So I guess
there are four electrical contacts in an F2 body. Of the four Nikon
cameras I own (a Nikkormat FT3, a Nikon EM, a Nikon F2S and a Nikon
F2A) I have never had a problem with the battery contacts. The only
time I've had a problem with the battery contacts is with my SB-11
flash (which incidentally I love).

O.K. The primary problem with the Photomic and Photomic-TN
finders for the Nikon F is that they use two PX-13 cells -- mercury
cells which are no longer made. (Same for a rather nice digital caliper
from Brown & Sharpe.)
...
I think Instamatic cameras used 126 film. 110 film comes in a small
cartridge which looks like a pair of spectacles from above. It was
popular in the '80s and possibly earlier.

I just gave a key chain camera to a collector friend. A plastic cube
about 1" on a side that clipped around the 110 cartridge, complete
with shutter release and view finder. Got it in a box of misc. items
while yard saleing. I never tried it but it looked like it would take
pictures, my friend was impressed.

Aha -- you are right. I don't have an Instamatic, but I do have
a cute little tiny camera with a nice fast zoom lens which uses the 110.
I hadn't tried to get any film for it in a long time. IIRC -- it also
required PX-13 mercury cells.

A substitute can be made with an OA91 germanium diode in series
with a silver oxide cell. See Joerg's post, about 3rd one in
http://groups.google.com/group/sci.e...browse_thread/
thread/bf4fc0f2beb4e26c and also some posts and circuits in
http://groups.google.com/group/sci.e...browse_thread/
thread/9e2f2d5e9ff9c9ac. A UK company sells expensive adapters:
http://www.smallbattery.company.org.uk/sbc_px625.htm
Gerry :-)}
London, Canada