Megadap ETZ21 Pro is an autofocus adapter designed to use Sony E-mount lenses on Nikon Z mirrorless cameras. Its very thin construction compensates for the flange distance difference between the two systems while maintaining electronic communication between lens and camera body when the combination used is compatible. The adapter supports functions such as autofocus, electronic aperture control, EXIF data transmission, AF-S, AF-C and AF-F modes, Eye-AF, face detection, and use of the AF/MF button found on selected lenses. It is designed to work with many Sony E lenses and various third-party E-mount lenses, including models from Sigma, Tamron, Zeiss, Voigtländer, and Samyang, although performance may vary depending on the lens, camera body, and installed firmware. The Megadap ETZ21 Pro also supports advanced operational functions such as focus shift, pinpoint focusing, timelapse, and interval timer on compatible Nikon Z bodies. The Pro version introduces improvements in compatibility with Nikon Z cameras, focusing stability, and autofocus handling during video recording. The adapter is firmware upgradable and represents a technical solution for photographers and videographers who own Sony E lenses and want to use them on the Nikon Z system while retaining, where supported, electronic automation and shooting data. It is still advisable to verify the specific compatibility of the camera-lens combination before professional use, as not all functions are guaranteed with every lens or body.