Comparison of Canon EF 16-35mm f/2.8L III USM and Tokina 14-20mm f/2 AT-X 142 AF PRO DX SD

Attribute	Canon EF 16-35mm f/2.8L III USM ×	Tokina 14-20mm f/2 AT-X 142 AF PRO DX SD ×
Notes	Image stabilization; dust and moisture resistant	Available AF Mounts: Canon and Nikon Digital Only; Built-in AF motor for use with all Nikon DSLRs; Included Accessories: BH-823 Lens Hood
Magnification Ratio (x)	0.22	0.12
Filter Size (mm)	82	82
Length (mm)	127.5	106
Closest Focus (m)	0.28	0.28
Diagonal Angle of View (degree)	63.00 - 108.20	71.80 - 91.70
Focus Details	Inner focusing; AF with USM, full-time manual focus	Internal with One-Touch Focus Clutch mechanism
Focal Length (mm)	16.00 - 35.00	14.00 - 20.00
APS Equivalent	26 - 56mm	1.5x: 21 - 30mm; 1.6x: 22.4 - 32mm
Brand	Canon	Tokina
Image Circle	35mm	APS-C
Name	Canon EF 16-35mm f/2.8L III USM	Tokina 14-20mm f/2 AT-X 142 AF PRO DX SD
Weight (g)	790	725
Type	Wide Zoom	Wide Zoom
Aperture (f)	2.80 - 22.00	2.00 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	-
Lens Construction	16 elements in 11 groups, including 2 large-diameter double-surface GMo (glass-molded) elements, a ground aspherical element, and 2 UD elements	13 elements in 11 groups, including 3 aspherical and 4 SD elements
Zoom System	Rotary	Rotary
Diameter (mm)	88.5	89