Being older the fast Focus function on a scope is not an option I can do without I've been really pleased with minox and vortex they're almost as good as Zeiss I have a diamondback on a 8 millimeter Remington Magnum that I put about a hundred rounds through and it's doing great I've got a minor Z A5 HD on a 7mm STW that is stage set for about 5 years now I have Nikon prostaff buckmasters and monarchs but I've had no problems with I am leaning more and more to vortex