#1. "RE: QR Plate for D3100" | In response to Reply # 0nrothschild Registered since 25th Jul 2004Tue 23-Nov-10 07:26 AM
Wimberly makes the P5 generic plate. Kirk makes a couple of generic plates... try this link and select "universal Fit" from the Camera brand drop down.
I haven't used either so don't know how well they fit. A universal plate is a good thing to have handy, though, for times like this or for a borrowed camera.
my Nikonians gallery.