Sea & Sea SS-31109 Zoom Gear for Canon 17-40mm Lens

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Sea & Sea SS-31109 Zoom Gear for Canon 17-40mm Lens
This Sea & Sea zoom gear is to be used with the Canon EF 17-40mm F4L USM lens in the NX fisheye dome port (56401) or in the NX compact dome port (56601) along with extension ring 40 (56111).