• Professional f/2.8L large aperture standard zoom lens
• Newly developed 18 elements in 13 group optical design
• 1 Super UD and 2 UD lens elements
• 9-blade circular aperture
• 0.38m minimum focusing distance
• Fluorine coating to make cleaning easier
• New zoom ring lock to lock the zoom position at wide end
• A 15% weight reduction compared to previous generation