Really? I've heard this about the 2.5-20 NX8 but not the 4-20 ATACR.I don't know about the 4-32 but I know the 4-20 tunnels. I am not sure exactly where it stops but I want to say 5.5x or so. If it was a true 4-20 I would own several.
That is different. When a scope tunnels you will not get an increase in FOV beyond a certain level. So if a 4-20 scope tunnels between 4 and 6 power, for example, it is essentially a 6-20 scope.I took the Tenaebrex covers off my 2.5-20 NX8s and no more tunnel vision. Looks better too if you ask me.