I'm not sure about Digital 8, but the following works for me on my Sony PC3.
1. Attach camera via firewire and switch off.
2. Take tape out.
3. Set camera to Memory (ie not video camera or record. then using the camera controls cue up the first still you want to bring in.
4. Open imovie and click import
5. Manually (again using the camera controls) step thru the stills you've saved on the memory stick.
6. Stop import and review the clip which should have your stills on it.