This was something i've been after for quite a while.
THIS is a very popular plugin, but the trial version limits the search to 20 images or something like that..
Plus the full version costs around $15
A search for alternate option brought me to this-
[h=1]The Duplicate Finder for Adobe Lightroom[/h]
Teekesselchen is a fast duplicate finder plug-in for Adobe Lightroom using EXIF meta-data.
It is open source (hosted on GitHub) and free of charge.
It requires Lightroom 3.x, 4.x or 5.x and runs on Windows as well as on Mac OS X.
DOWNLOAD
