The Mark 5HD riflescope built around Leupold's Professional-Grade Optical System offers unmatched light transmission that's designed to outperform in the most challenging lighting conditions. Its industry leading glare reduction provides a clear image in harsh, direct light while the resolution and clarity will meet the demands of any professional guide or shooter in the field. Features custom dial compatible, side focus, Twilight Max HD, first focal plane, Nightvision Compatible illumination, M5C3 ZeroLock adjustments, Illuminated, Zero Lock dial and Zero Stop.