That's the question that Moondog tries to answer in his video review of the Leupold Mark 3HD optic... "I bought my first Leupold a Mark 3HD 8-24×50 to pair with my new Ruger Precision Rimfire 22LR rifle. Its optical performance did not disappoint. In my camera testing and naked-eye observation it produced stunningly sharp and bright images with its HD glass.