You CAN'T scan a transparency by reflection. I mean, you can if you want, and get an image, but it will be garbage. That's because the reflected light passes through the transparency TWICE. That will cause the image to be doubled to some extent, and the contrast will be double too. Plus it will be very dark, and there will probably be ugly reflections of the scanning light. In short, garbage.
DOH! I'm so thick sometimes. I just didn't think of that. Thanks. That rules out using either one of my current scanners. Maybe I'll consider a dedicated 35mm scanner like Gerry mentions, above. Shooting film used to be easy. Jeez!
Nope, just looked at prices. I'll pay the developer $5/roll for a while.