I just bought a Zeiss V4 3-12x44. Haven't installed it on the gun yet, waiting for deer season to end. I did alot of research and most of it tended to indicate having an objective larger than 44mm didn't help much, if at all in low light. I am sure some of you will disagree, but that is what I found.
I do like the 30mm main tube though. It seems like I wider image to me.