>>I learned the hard way thet the SQ-A WILL fire the shutter with a dead battery, but ONLY at 1/500th sec.<<

I also learned the hard way with my SQ-A to always carry a fresh battery with me out in the field, and also not to wind the film advance until I'm setting up to take the next shot. Advancing the film keeps the battery "on" and assures less battery life. As for the 40 mm wide angle, I haven't used it, so can't offer an opinion. My 50mm is a wonderful lens, however, for 99% of the time a wide-angle is called for....