Originally posted by stevebrot I don't know about the K-x, but I have a K10D and a K-3 in front of me and both have a mechanical linkage in the form of a small catch that is released by the flash button. The release if purely mechanical and works even with the battery out.
Interesting observation. My *istDL, K100D, and K200D are all electronic release and have the flash button on the back of the body. However, my K-30 is indeed mechanically released, and has the flash button on the side of the body, like the K-3.
So, it appears if the flash button is located on the back, it requires a battery and electronics to release, and if located on the side, it does not require a battery and is mechanically released.
The K-x flash button is on the back, and is probably electronically released. Obviously, mechanical release appears to be more reliable.