The Leupold Light Optimization Profile delivers the light transmission and light throughput benefits of a large objective, yet mounts like a riflescope with a much smaller objective lens for a better cheek-weld and more comfortable shooting. The Leupold Xtended Twilight Lens System optimizes the transmission of low-light wavelengths, so you see the details of low-light scenes in greater, brighter detail than with any other riflescope available. Low-profile SpeeDial adjustments smoothly slide up and open for adjustment.