Yes, it does work correctly and it's evident that there is a huge amount of work...
Marcus - I downloaded and compiled libgphoto2-2.5.7 and gphoto2-2.5.6. Now capture-preview...
Ahah. OK, --filename and --force-overwrite both work when they are on the same command...
Cannot set download file name
capture-preview not working on Canon T3i
Man page suggestion: capture-preview available from shell
Man page suggestion: get-thumbnail has an argument
Bug in shell: tab completion adds extra space to filename