...super 8 film in cartridges and on reels. Want to convert to DVD...
hmm, that is less a computer, more a "mechanical" problem 😉
you could use your projector and the silverscreen in a dark room, place your camcorder close aside the projector and "record" the projection..
problems:
"hot spot" - the middle of the projection is much brighter then the broders
flicker - your super8s use 20, 18, 15, 12 (?) fps, video is in the US 30fps...
sharpness/brightness - your camcorder has to be able to switch off any automatics, otherwise, the pic will "pulse"...
for a few takes, I would give that a try... to transfer family's history, I would spend a dime... they use xx k$ hardware, which accomplishes that task much better (make a test, before transfering all 127 wheels of film...)
buuut:
try to find a company which transfers from super8 to miniDV (=tape)!!
in case, you want to edit the footage, you avoid loss during the lossy process of converting dvd=>iMovie...
you have much more options to create a nice (=edit just the best scenes), good sounding (add commentary & music), excellent looking (menus) dvd on your Mac....