Vizelex ND Throttle Lens Mount Adapter - Nikon Nikkor F Mount G-Type D/SLR Lens to Sony Alpha E-Mount Mirrorless Camera Body with Built-In Variable ND Filter (1 to 8 Stops) Mounts Nikon Nikkor F Mount G-Type D/SLR Lenses to Sony E-mount mirrorless cameras; infinity focus or beyond allowed Built-in Variable Density Range: ND2 - ND256 (1-8 stops);Integrated aperture control dial for adjusting the lens aperture Enhanced craftsmanship and high-tolerance construction for demanding professionals Precision all-metal construction with chrome plated brass mounts for secure and solid fit Limited 2-Year Manufacturer Warranty