Based on a sunny day and 5000+Feet above sea level. Very low humidity and thin air. Best possible conditions. Mounted on a better tripod than comes with the scope. I could see clearly past 300 yards in detail. Holes of 223cal @ 200 yards and 30cal@300 yards and never got to 60X. Cons! Took some time to get fine focus tuned in. Needed to be set before it left factory! You didn't know better you would think is was a bad one. Must be mounted on a very stable platform. Very good optics for the price.