Amazon carries the batteries that you need as well as many types of black and white and color film.
Thanks to ch_cannon's post on using film I dragged... (
Just Google for the manuals for the cameras and find the battery info there.
Pentax Spotmatics that used mercury batteries had a bridge circuit for the meter. When the shutter speed & f-stop were adjusted for proper exposure the current thru the meter was 0 when the meter needle was centered. The voltage of the battery did not make any difference than.
The diameter of the mercury used was smaller than the other sizes too small to use a S76 size silver oxide battery. I had some luck with a smaller watch battery size & some aluminium foil to fill the space. However this meant I had the polarity revised. As I moved the diaphragm ring the meter needle moved in the opposite direction from what I expected. That made it a little clumsy to use.
The beautiful Canon EF, built expressly for the battery dilemma. It was rather limited in sales and production as it's Canon competition was the canon A-1 and Canon F1(?) It was gorgeous and commonly known as the "Black Beauty".
Not many mfrs did this but the camera was built with voltage reduction circuits that reduced all batteries to 1.35 volts, and it worked. In addition it used two batteries (one for the meter/program circuits, and one for a special high speed shutter circuit).... each capped at 1.35 volt, no matter what battery was used, although Alkalines, as in all situations, were never stable enough to deliver a linear power curve. I've owned 3 of these all nearly mint and and simply beautiful. There was a common shutoff on both battery circuits. I could throw almost any battery delivering over 1.35 volts and the protection circuits would stabilize both circuits at 1.35.
Not many manufacturers did this on camera's and it offered the opportunity to slap almost any battery from any manufacturer in either of the two battery compartments.
The camera was manual focus, using the FD lenses and very well built. It was a pleasure to use and a pleasure to look at. The Canon EF (the model), not a lens designation and readily found on eBay. Held up well as a result of the semi pro build quality.
I never had a battery problem or that confusion with the Canon EF Camera, although I used them alongside the Canon A-1 (not A-E1) which had no such protection.
In addition the camera could be used with manual over/ride and hand held metering. A really great camera. The EF all black. never came in silver/black color scheme.
Of all the OP equipment I don't know about the Yashica because the OP didn't say which model. The Bronica S doesn't take any battery. The F2 Photomic can use a wide variety of batteries readily available (MS76, EPX76, LR44, A76, 357) or even the 2L76 which can be used in place of the 2 MS76's.
Only the Gossen Luna Pro requires mercury batteries which no longer available but there are some substitutes available. Personally if I have a Luna Pro (which I did have) I simply not use it.
I don’t know about the batteries for an F2, but the N8008 I inherited from my father uses AA penlight batteries and it still works perfectly.
I am not certain what the F2 uses.... I see some p... (
According to the instructions for the Nikon F2 Photomic -
The meter in the Photomic finder is powered by 2 1.5v silver-oxide batteries.
The Gossen Luna Pro light meters which rely on the mercury-oxide batteries, can be converted through the use of a voltage regulator. There are a number of companies which can do this; there are also several You Tube videos showing how you can D-I-Y.
If you have an old battery get the name from it. If you can't see it clearly magnify it. Go onto Amazon and perform a search of the battery. I did this for a Gossen hand held meter and a replacement battery for a Nikon F meter and was surprised to find that they existed. The Gossen works but the Nikon meter didn't.