SN15-F Focus Gear ~for Sigma 15mm F2.8 EX DG Diagonal Fisheye 6S This dual flip holder allows

This dual flip holder allows for use of two M67 wet-mate optics like the SMC-1 or CMC-1 on M67 Macro Ports

The internal port opening of this port is enlarged for larger diameter lenses like Canon EF 11-24mm f/4 USM

6 GII lens

and is tack sharp in the corners

This zoom gear is for the Canon EF 16-35mm f/4L IS USM lens

SN15-F Focus Gear ~for Sigma 15mm F2.8 EX DG Diagonal Fisheye 6S This dual flip holder allowsFocus gears allow access to the mechanical zoom function of many lenses. Use of these gears may require specific port extensions and may not be available for all housings and lenses. This focus gear is specific for the Sigma 15mm F2. 8 EX DG Diagonal Fisheye lens.