So as you probably know the Bolex P4 and many other 8mm cameras had what is known as the Auto Eye or Auto Iris. This device acts as a light meter and automatically changes the F-Stop on the camera. If your 8mm camera takes any type of battery this is probably what the battery powers. The P4 has a manual control if your auto eye isn't functioning. This was the case for me, I needed new batteries. 2 strange out dated 1.5 volts that look like stubby AAs. I had to go to a specialty battery store to get them and they had to order them.



$8.00 (more than the cost of the camera itself) later the auto eye is working great. When I point the camera at different lighting conditions I can see the F-Stop indicator turning away.

Now All I need is some film.
-Andrew