Ear Mountain, and the others that have responded to my post, thank you for the detailed information you provided. I'm now having a "duh what was I thinking" moment. Of course the shutter is "mechanical"! Thank you all for your patience! The origin of this post was that I just took in a little "rescue" dog. Cute as a button, but she simply panics when I take out the camera and try to photograph her! I'm slowly getting her use to the sight of the camera and cell phone, etc., but the camera noise sends her into a panic.