It seem the new Harry Potter film (Deathly Hallows Part 2) was shot in 2D with standard camera, and was converted to 3D after the post production stage. The movie was recorded with a standard movie camera and shot with the understanding that the result was going to be presented in 2D. Adding 3D to the title was an afterthought.

A true 3D movie is shot with a camera system designed specifically for that task—it involves two lenses (one for each eye).

So be aware before paying extra for 3D version

http://screenrant.com/harry-potter-d...d-benm-121606/