I'm new to Mac, & photo SW. I seem to be accumulating a lot of "duplicate" photo files. Some are in iPhoto & some are in Aperture. I import the files from the camera with Nikon transfer. Then I import them into iPhoto. Then I may import them into Aperture. When I use Finder I see multiple file with the same name & either the same or different file extension. I'm going to stop using Nikon transfer, & directly import from the camera to iPhoto. This should help. Is there a way to sync photo files to eliminate duplicates or an easy way to organize files so I can delete duplicates?