Comparison of Canon EF 11-24mm ƒ/4L USM and Tokina 16-28mm f/2.8 FF Opera

Attribute	Canon EF 11-24mm ƒ/4L USM ×	Tokina 16-28mm f/2.8 FF Opera ×
Magnification Ratio (x)	0.16	0.19
Notes	Weather resistant; Subwavelength Coating (SWC) and Air Sphere Coating (ASC); Fluorine coating on front and rear lens surfaces; Built-in lens hood.	Available AF Mounts: Canon EF, Nikon F; Included Accessories: lens cap, fixed petal type hood.
Focus Details	Internal with ring USM; Full time manual focus	Internal with SD-M (Silent Drive Module) DC motor; One-Touch Focus Clutch Mechanism
Closest Focus (m)	0.28	0.28
Lens Construction	16 elements in 11 groups, including 1 Super UD, 1 UD and 4 aspherical elements	15 elements in 13 groups, including 3 SD and 3 aspherical elements
Length (mm)	132	133.5
Focal Length (mm)	11.00 - 24.00	16.00 - 28.00
Diagonal Angle of View (degree)	84.00 - 126.10	76.90 - 107.10
Brand	Canon	Tokina
Image Circle	35mm	35mm
Name	Canon EF 11-24mm ƒ/4L USM	Tokina 16-28mm f/2.8 FF Opera
Weight (g)	1180	940
Type	Wide Zoom	Wide Zoom
Aperture (f)	4.00 - 22.00	2.80 - 22.00
APS Equivalent	17.6 - 38.4mm	1.5x: 24 - 42mm; 1.6x: 25.6 - 44.8mm
Diaphragm Blades Type	rounded	-
Diaphragm Blades	9	9
Zoom System	Rotary	Rotary
Diameter (mm)	108	89