17-50mm F2.8 EX DC OS HSM

Gear to control the zoom of the Sigma lens in use inside the housing. Built in light but resistant plastic material to protect the lens from damage and featuring dual O-Ring seals to have a better grip. The gear's cogwheel is whole.

• Material: darlin;
• Dual O-Ring seals;
• No pulling strain on the lens gear;
• Whole cogwheel gear.