Are you talking VX-5HD and VX-6HD? If so I think they are pretty much the same scope except the 6HD has an reticle level indicator feature and comes with ALUMINA FLIP UP LENS COVERS and a THROW LEVER for the power ring. The 5HD has a really wide PLEX with a little thinner lines than the standard Leupold PLEX. I have seen pics of the PLEX in the 6HD and I believe it is heavier and not as wide a PLEX as the 5HD. I think it has the same plex reticle as the original VX-6.
