https://youtu.be/JgDf-eDg_3A?si=GeZJaXWK_1lafAOT The Swarovski Z3 3-10x42 concentrates on the essentials - it's light, compact, and reliable. The entire scope is fully water and fogproof thanks to a meticulous nitrogen-purging process. The low-profile turrets offer ¼ MOA click-stop corrections, and the quadratic adjustment range provides a generous 50 MOA for both windage and elevation correction. The lenses have been fully multicoated to optimize light transmission, and the external lens surfaces have been treated with a scratch-resistant SWARODUR protective coating. This Z3 riflescope is configured with a 1.0" tube and a Plex reticle in the second focal plane. The parallax correction is factory preset at 109 yd/100 m. A mounting base and rings are used to attach a riflescope to a firearm. A comfortable sight picture is contingent upon the height of the rings. A comfortable cheek-weld is the result of properly positioning the scope over the receiver. Mounting the scope close to the receiver is preferable, yet scopes with larger objectives need higher rings so the front bell can clear the barrel. It should be noted that in many mounting applications, a professional gunsmith's skills will be needed for proper installation.