The system allows you to lock down your zero position and dial back to it with a sharp and precise stop right at your zero mark even you are turning it in pitch-dark or blind folded

Extra-Low Dispersion glass gives you an image with little or no chromatic fringe for an ultimate clearest and sharpest image.

Advanced Fully Multi-Coated lenses gives you better light transmission to bring optimum brightness and true color across the entire light spectrum