Thanks, Cameron. I just looked over the 'Gravity' topic in another forum and, yes, apparently, it's the 3D version disc that's a BD25. The 2D version disc is on a BD50.
Mark
Word has it that 'Gravity' is stuffed into a BD25 with a relatively low video bit rate. Can you confirm that, Cameron?
Of course, with all of the blackness of space, there isn't as much of a need for a high video bit rate.
Mark