Finally

over 150000 photos and videos…
It took a while but trimmed down 50 gig in duplicatephotos and movies alone. (Yes I know only a moron would have that many duplicated files.) Having made the switich from PC to MAC I have discovered it is much wasier to duplicate groups of files while transfering between locations than on PC. This program works the way a dupicate file finder should work. It finds what it thinks are duplicates and makes it easy to double check. (it never missed)

Spadoinkel about Duplicate Detective: Cleaner