Also, what's the battery for? The exposure meter?
As can be gleaned from other posts, the battery powers the meter in the shutter-priority automated mode. This is a very convenient way to work, as it shows you the corresponding aperture in the finder and you can lock the meter reading by pressing half-way down on the shutter button. There is no metering in manual mode, but you can set the aperture and shutter speed manually, and fire the shutter (take a picture), without a battery.
By the way, for my shooting style, automation (shutter-priority or aperture-priority) without AEL (auto exposure lock) is useless. In the Canonet, pressing half-way down on the shutter button provides your AEL. You would use this, for example to aim the camera downward away from the sky, to prevent the sky - normally much lighter than the ground - from causing underexposure. You would point the camera downward, lock the exposure by pressing half-way down on the shutter button and trapping the metering needle in the finder, then you would raise the camera, recompose the image, and shoot.
I normally scan a scene with the camera and watch the range of meter readings, I choose the representative reading that I want, and I lock that reading. Then I recompose and shoot.
You could do the same thing with the X-700 in aperture-priority or program mode, except that you use an AEL button to lock exposure.
I have an X700 and a QL17. My X700 is a great camera when it works but it has some seemingly insolvable electrical problems. The QL17 has never given me one moments grief. It has a super sharp lens, a bright viewfinder and a better build quality than the X700. It is not an M3 but nothing else is either but it is still a superb instrument. I use it frequently while the X700 stays in the closet.
This surprises me. I have a couple of X570s (basically X-700s with no program mode, but with enhanced metered manual and TTL flash), they have never failed me, and I consider them better made and more rugged than the Canonet.
- Murray