Nikonos Adapter for NA-A7II//A9/A7RIII/A7RIV/a2020/A7CReady to reuse those Nikonos lenses with your new Sony mirrorless? This adapter allows the use of supported Nikonos lenses on the NA A7II A9 housing. Technical Specifications Depth Rating 100m Port System N100 Weight Port Opening Diameter Port Diameter Body Material Anodized Aluminum Alloy Port Material Port Coating Port Shade Material Removable Port Shade Spare O ring 90143 split Technical Data: Effective length: 65mm Only compatible with the Nikkor