Canon EF 16-35mm f/2.8L USM

The lens model will be marked on the outer side of the front lens ring. It is marked as "CANON ZOOM LENS EF 16-35mm 1:2.8 L USM".

General:

• Focal Length: 70-200 mm
• Maximum Aperture: f/2.8
• Minimum Aperture: f/22
• Closest Focus Distance: 0.28 m
• Maximum Magnification: 0.22 x (at 35 mm)

Construction:

• Lens Groups: 10
• Lens Elements: 14
• No. of Diaphragm Blades: 7
• AF Actuator: USM

Physical:

• Lens Mount Type: Canon EF
• Filter Diameter: 77 mm
• Maximum Diameter x Length: 83.5 x 103 mm
• Weight: 600 g

Accessories:

• Lens Hood: EW-83E
• Soft Case: LP1319
• Magnification - Extension Tube TF12 II: 0.87 - 0.36
• Magnification - Extension Tube TF25 II: 1.09 - 0.80

Source: Canon Camera Museum Webpage & Canon Specifications Page

Wikipedia: Canon EF 16-35mm lens

Canon Camera Museum Webpage

Canon Specifications Page