Not sure if anyone knows but, cs3 and back the aspect for ntsc wide was 1.2 which comes to 864 480 square, 720 times 1.2, now with cs4 they have it as 1.2121, so if I bring in footage from cs3 or earlier, there is a small amount of black on the left and right, I can interpret footage and change it to 1.2121 and it fills the screen, but my question is then, what is the correct square aspect, 720 times 1.2121 is no longer 864, not sure if any of this matters to anyone, just annoys me.

Anyone have a clear head on this?