Originally posted by bobmaxja K-X is not a mechanical camera? WSothout bateries it's simply do not work
I have to disagree with this
The KX (not to be confused with the K-x digital camera) is a fully mechanically operated camera with matched needle light meter,.
Only the light meter requires a battery. The shutter is a clockwork shutter and you can actually hear the mechanism time during long exposures.
As for the benifits, one of the things I can think of, which has not been raised yet is the older mechanical cameras are MUCH stronger. Many plastic covered early 1980's cameras suffered from temporary electrical failure if you put a large lens on them and mounted the whole thing from the tripod socket. The frame distortion caused intermittent battery contact and electrical function. My Ricoh XR-2s was famous for this, but by no means alone.
there is a limitation however, that most mechanical timed cameras are horizontal travelling shutters with 1/60 sync and 1/1000 max shutter. The cameras also suffered a little when using infra red film because the cloth shutters were not totally infra red opague