Played around a little more. I tried using the transparency adapter backlight from my old Epson 1640SU scanner with my camera instead of using the flash. Eventually I will probably want to use the flash, but I need to build a rig for it because there is no other way. At least with this backlight, I can figure out the best lens and distance and focus, etc. because I can use live view and see it instead of taking a picture in the dark that gets lit up only when the flash goes off and checking the focus after the picture is taken. What a pain that is!

I adjusted the color/levels with Photoshop, so it is probably a bit too bright, but the results are similar. The idea is to save tons of time eventually because it is close enough to the scanner in quality. The scanner adds its own artifacts, so before saying it is better, look closely and see if you really see any more detail (aside from blown out highlights from my adjustments).

Another idea I had is to use the transparency backlight adapter with my new scanner which would allow me to scan a lot of frames in one pass. Then I would just crop each of them to files quickly manually or automatically. That may be the ultimate solution, but I haven't tried it yet.