I used a Fuji S1 on a Bessler slide duplicator (uses a tmount adaptor)
for this, for slides to PowerPoint. Worked well, the S1 is Nikon D60
based and a 3mp camera, (also used my Nikon 995 on a copy stand with
this duplicator). Has some advantages over my scanner (Minolta Scan
Multi). This doesn't give the resolution the scanner does, but the dupe
lens is a Rodenstock 60mm made for slide duping and it sure is faster.
Make sure your cmaera is set for lower than normal contrast as slides
can easily clip highlights and block up shadows. Even with the 995 I
could get more dynamic range in shadows than with the scanner playing
with contrast settings, exposure and the duplicator's filters, these
were some medical slides with shadow detail and highlight detail.
If you are planning on printing I'd still go with a scanner as most
will give larger files, but for archiving, web and presentations duping
works fine.

Tom