A 35mm Depth of Field (DOF) adapter is used to give video a cinematic quality often called "that film look". So, you can record to almost any High Definition (HD, Full HD) or Standard Definition video Mini DV, HDD, DVD, SD camera and get the shallow Depth of Field that helps to separate objects from their background.
More about it here: http://en.wikipedia.org/wiki/Depth_of_field ; http://en.wikipedia.org/wiki/Depth-of-field_adapter
