These are the best of what I got at the Fall Meeting of the Northern California and Nevada section of the American Association of Physics Teachers. The event was Saturday, November 16 at Carondelet High School in Concord.
All captured on my little spy-cam of a Canon PowerShot S100. It's not a speedy auto focuser, but it's so small as to be fairly innocuous. And it's a digicam rather than a DSLR, so no shutter noise. Trade-offs.