Is there any YASHICA camera (film 35 not digital) that could shout pictures without batteries?

i have heard that one of old yashica (1970-1980) would take pictures without batteries after being exposed to the sun light for a good time

The old style 100% mechanical cameras only needed a battery for the light meter. Exposure to the sun had no effect on them to the best of my knowledge.

Let me prefix this: I don't know the answer, and I'm not 100% sure on the question. BUT, I have knowledge and maybe some of this can help:

The batteries on *manual* 35mm cameras was frequently only used for the light meter. I'm assuming that this isn't the question, because you could take the picture, you just couldn't get an exposure reading. In the 70's there were several cameras that weren't fully automatic but required a battery to work.

There are a few ways that a camera might expose the film without the photographer engaging the shutter:

- the shutter was sufficiently thin. If an it wasn SLR camera, that would also require that enough light went through the mirror. A TLR or rangefinder camera wouldn't use that mirror, so it can be tracked down to the shutter again. If it were a cloth shutter, I know those had to be replaced periodically.

- the shutter was electromechanical, and required a battery to stay full closed. A diaphragm shutter in particular would behave very much like a very stopped-down lens which would eventually take a picture if it wasn't quite fully closed and there wasn't much movement.

- Any shutter that wasn't on the focal frame would turn into a pinhole camera if there were a hole in it. Again, I don't know which Yashicas had which kinds of shutters.

My best guesses would be

A. The diaphragm shutter of the Yashica Electro series (which required a battery) might have required the battery to be in to stay 100% closed, and if the diaphragm relaxed a little, then it'd be equivalent to shooting at maybe f/64 or smaller, but eventually maybe the light could get through. Here I'm just hypothesizing based on what I know about cameras and that one person somewhere said that the shutter was "suspect".

B. The Yashica M5 appears to be rare enough that a similar kind of flaw could have escaped general attention, and it *required* a battery to operate.

But I really don't know, either. I'm just hoping that I can help you or someone else find the answer more easily.