External compositing tag

Hi guys,

Just a quick question about the External Compositing Tag.

Whats the best way to match up the sizes so in After Effects the Solids are the same size in proporition to the camera like the object youre tagging is in C4D.

In the image below the units Im using is in mm but when i put those exact same sizes in the solid size on the tag in C4D the size of the solid in AE is huge!

Now I know Greyscale gorilla does a tutorial that shows this and he's using meters instead of mm but hes using whole numbers. If i use meters in C4D this size plane becomes 2.464 m and the tag wont let you put 2.464, it automatically rounds it down to 2.

Does this make sense? If so any help would be awesome.

Thanks

Chris

a href='http://images.creativecow.net/225665/screenshot2012-02-07at18.15.45.png'>