The aspect ratio thing has to do with the aspect ratio for video formats.
In maya you can set the pixel aspect ratio to square pixels and I believe this will correct the problem or you can just leave it at the default in maya and then in photoshop you can correct the pixel aspect ratio there (Image>Pixel Aspect Ratio). Six of one half a dozen of the other really.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 31-07-2012 at 11:12 PM.