Try this! Reviews are correct

Looking to carefully delete your duplicate photos without causing chaos? for 99c or less you can do it with this app.
Works fast like the other review said… 35,000 pics scanned in about 70 seconds.

Easy to use.. and if you want to get the pro version, its 99c. ( deal!)
I have tried about 5 other programs for ipad, iphone etc but this is the easiest and secure i have found.

Battyguy about Duplicate Cleaner For iPhoto