I'd been looking at some techniques for [ turning real photos into models](http://fleacircusdirector.blogspot.com/2007/10/more-depth-of-field.html) by adding faked depth of field and thought that this would be an excellent idea to add to my flea circus.

However, when I turned on the depth of field, I got horrible jaggy edges, see attached example.

Is there something I can do to eliminate or avoid this problem, this will eventually be a 5 minute movie with 25 frames per minute so I don't want a manual fix.