I have several vari-x III 50mm scopes and i have one vari-x II 50mm. I'm no scope expert but the III is suppose to have a better lense than the II but to be completely honest with you i can't really tell any difference in the two just by looking through them as far as clarity goes and i don't think you will either. Leupold makes great optics and i think you will be satisfied with which ever one you choose. Good luck.