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We have set many people up with this lens in Sea and Sea housings. I always recommend the NX fisheye dome port over the other compact dome ports for the best image quality.
Extension ring 40, +2 diopter with the NX fisheye port, or +4 diopter with the compact dome ports. There is no gear available from Sea and Sea, but we have machined a gear to fit this lens.
Best regards,
Jim
Backscatter