After reading through some reviews online I decided to buy a Center Point Optics 4-16x40 scope. It has an adjustable objective from 5 yards to infinity so my question is, where do I set it? The reason I'm confused is because the flip up cover slips onto the ring so if it's "adjustable" then the flipped up cap could be in the 9 o'clock position when open all the way over to the 3 o'clock position, depending on where I decide to set it. Can someone explain this to me? Should I just set it close to what my target will be (100 yards, etc)? TIA for any and all replies.