Aquatica 18700.1 Focus Gear for Canon EF 100mm f/2.8 Macro USM & EF 100 f/2.8 IS USM Lens Housing Accessories This filter measures approximately 75mm

This filter measures approximately 75mm in diameter

This clear door allows you to see the o-ring seal

Both filters use the same filter recipe

Aquatica Dual Strobe Connector Kit with Nikon Type Hot Shoe

Ikelite DS-161

Aquatica 18700.1 Focus Gear for Canon EF 100mm f/2.8 Macro USM & EF 100 f/2.8 IS USM Lens Housing Accessories This filter measures approximately 75mmAquatica Focus Gear #18700. 1 for Canon EF 100mm f 2. 8 Macro USM & EF 100 f 2. 8 IS USM Lens Compatible with Canon EF 100mm f 2. 8 USM and IS USM lenses in Aquatica's compatible Dome Port. Please contact us for compatible ports. Special Order Product 4 6 weeks delivery.