90K views · 3.5K reactions | Parallax error is invisible unless you know what to look for and can cause you to be off by 1 moa/ .3 mRad. That’s big enough to wound or miss at 500 yards. Far too many shooters and even shooting instructors describe parallax as a focus knob. Every time you change magnification you need to check parallax. Follow along and next time I’ll get into first focal plane vs second focal plane. This lesson has been brought to you by @levrack | James Nash | Facebook