I've always used rifle scopes with the standard two adjustment knob set up. I'm aware of scopes with the third knob on the left. To my memory they've always been listed as the SF or Side Focus knob. Self explanatory.
I was on Natchez today looking at scopes and I saw a Weaver 4-16x44 with a third knob listed as a SFP, Side Focus Parallax adjustment.
Is this a just a regular side focus knob? I've never really understood what parallax is, other than it has to do with long range shooting.
I live in PA where all my shots are under 100 yards, so I never bothered to learn about it.
I was on Natchez today looking at scopes and I saw a Weaver 4-16x44 with a third knob listed as a SFP, Side Focus Parallax adjustment.
Is this a just a regular side focus knob? I've never really understood what parallax is, other than it has to do with long range shooting.
I live in PA where all my shots are under 100 yards, so I never bothered to learn about it.