smooth edges on aliased depth matte render

Hi all,

I wonder if there is a filter in after effects that can apply anti-aliasing to edges?

I'm using Red Giant Psunami and the depth matte renders have aliased edges which are a slightly noticeable when I apply a lens blur to get depth of field.

When I've had similar issues in the past with passes rendered from 3ds max, I've rendered my passes at double size then shrink them again in afx and it looks better.

but I'm already working at huge resolution (final project maybe 4 x HD)

thanks in advance

s