does this work on s100?
It should work with S100. I did close look on new S100 and it made small change on shutter side of strap attachment hole. But it will not bother you to use this neck strap. I used it at S95 but I sold my now since this camera is small enough to put it in the pocket. Buy that case is butter choice for keep camera with you. If you afraid of drop you camera, just use the wrest strap comes with the camera.
good luck, S100 is very best camera!