Ikelite 5509.31 Universal Zoom Gear for Lenses 2.8 to 3-inch Diameter (7/8 Length)
Ikelite’s universal zoom sleeve and lens clamp set works with larger lenses with zoom rings between 71mm(2.8-inches ) and 76mm (3-inches) in diameter. Ikelite’s unique sleeve and clamp design represents the most universal and affordable zoom gearing system in the underwater photography industry.
The shorter 7/8-inch length is designed specifically for use with the port mount featured on most Ikelite compact mirrorless and compact DSLR housings.
Refer to the appropriate Lens Port Chart for recommendations regarding lens compatibility.