The Leupold Mark 4 20-60x80mm TMR Spotting Scope is durable, precise and reliable, so much so that multitudes of military sniper teams have relied on it for real-world operations. The Mark 4 can be handheld with an easy to grasp rubber-armor coating, but can also be mounted on a tripod with its built in ¼ - 20 swiveling tripod adaptor port. The lenses on the Mark 4 have been treated with DiamondCoat 2™ ion-assist coating. This gives the Mark 4 a boosted level of light transmission for high levels of clarity, contrast and illumination as well as a heightened abrasion resistance for use in hostile environments. The 30 mm eye relief and fold down rubber eyecups insures a comfortable viewing experience even for extended durations of time, especially when using a tri-pod. Lastly, the Mark 4 utilizes the Xtended Twilight Lens System™. This system enhances the transmission of low-light wavelengths, giving the user more a more detailed and illuminated view even in low-light environments.