Zoom gears are necessary to interface with lenses' zoom rings in DSLR and mirrorless digital camera systems. Not all zoom gears are compatible with all housings. Please refer to the correct port chart to find the right zoom gear for your lens.
Zoom Gear for Canon EF 18-55mm f/4-5.6 IS STM (DLM/C)
Zoom / Focus Gear 5515.08
Zoom Sleeve for Olympus 7-14mm Lens (DLM Type B)
Zoom / Focus Gear 5515.42
Zoom Gear for Samsung 16-50mm Lens
Zoom Gear for Longer Lenses with DLM Port System