Sea & Sea SS-31107 Zoom Gear for Nikkor AF-S DX 12-24mm F4G Lens

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Sea & Sea SS-31107 Zoom Gear for Nikkor AF-S DX 12-24mm F4G Lens
This is the zoom gear to use with the Nikkor AF-S DX 12-24mm f/4G lens.
You would use this gear when using the lens with the following ports :
NX Fisheye Dome Port (56401)
NX Compact Dome Port (56601) with the SX Extension Ring (50261)
CX Compact Dome Port (46100) with the NX Compact Macro Port Base (56201)
Compact Wide Port (56280) with the NX Compact Macro Port Base (56201)