Hi PaQ, yeah it looks pretty darn close. It seems like possibly the formula is correct but maybe there is some kind of slight pixel padding happening that makes the aspect ratio match not quite 100% correct.

If you want a better match you could try to see what happens if you shave off 4 pixels or something off of the width and height that you put in the script.

Also, does Modo possibly have any other means of setting the angle of view, like an equivalent of the lens length of a 35mm camera or something like that? If so then that may be possibly easier to match.

- Michael