Vizelex ND Throttle Lens Mount Combo Adapter - M42 Type 2 (42mm x1 Screw Mount) to Sony Alpha E-Mount Mirrorless Camera Body with Built-in Variable ND Filter (1 to 8 Stops) Mounts M42 Screw Mount SLR Lenses to Sony E-mount mirrorless cameras; infinity focus or beyond allowed Built-in Variable Density Range: ND2 - ND256 (1-8 stops); Comprised of two adapters to make lens/camera combination possible 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