At our March 6th meeting, Jim Leask demonstrated how to easily and quickly copy slides using a DSLR, an off camera flash and a slide adapter. You can review his notes here.
The adapter he used to hold the slide in front of his camera is a Nikon ES-1 and is available from Henry’s. Note that it is a 52mm thread so you may need an adapter for your lens. Note also that, if you don’t already own a suitable macro lens, you can use extension tubes to adapt whatever lens you have to close focus.