This Nimar Extension Ring with Mechanical Zoom Control & Lock
is compatible with the Nikon AF-S DX 16-80mm f/2.8-4 E ED VR lens and fits on underwater camera housings compatible with Nimar NIM-108 or NIM-108WS port systems. Depth-rated for 197', it is made of acetal resin and comes with two O-rings. For full compatibility info, see the NIM-108 (standard) Port Chart
or the NIM-108WS (water sports) Port Chart.