was just checking it out on the zeiss website and it seems maybe...could it be...
"Those CONQUEST HD5 models with target turrets have a newly designed lockable target turret with a zero stop. To adjust the elevation or windage, you will lift up on the turret, make any necessary adjustment, then push down on the turret again to lock it into place. It also features zero stop at the zero reference. The CONQUEST MC turrets were neither lockable nor featured a zero stop."
I copied this from their site.
Also, the turrets now turn the same direction as most other scopes. That was my main problem with the conquest scopes, they were backwards from every other scope I owned.
Gary