Sigma USB Dock Mount:Canon EF Mount It has helpful features including

It has helpful features including multiple accessory pockets

Compartments: 6 (with padded insert)

photography novelties

8L IS III USM lens

RODELink Lav

Sigma USB Dock Mount:Canon EF Mount It has helpful features includingThe Sigma USB Dock allows you to connect your Sigma Global Vision lenses to your computer in order to update firmware and adjust focus setting parameters using the Sigma Optimization Pro software. This dock is only compatible with the Sigma Art, Contemporary, and Sports line lenses featuring a Canon EF lens mount. Sigma Optimization Pro Once a Sigma Art, Contemporary, or Sports line lens is connected, you can use the Sigma Optimization Pro software to