This is one of over 4720 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
To open this filter, you must have Filter Forge 1.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
The correct way to crop a zoomed image is by use of a -50 bias curve with a 2/3 end.
profile gradient zoom crop alpha bias curve