I have a Nikon omega 3-9x40 on my optima pro and I've got to say, of all the scopes I own this one has the clearest glass of all of them. It's a true pleasure hunting with that gun every late season. After looking through my other scopes all season, vortex,bush elites, nikons, it's refreshing to look thru the omega. Maybe I just got a really good one, don't know, but it's so clear it's like the scope isn't there and my eye just zoomed in on the target.
Anyways, sorry back to the diamond back. It sounds like it has better glass than the vipers from the reviews I read