Comparison of Canon EF 20-35mm f/3.5-4.5 USM and Tokina 19-35mm f/3.5-4.5 AF 193

Attribute	Canon EF 20-35mm f/3.5-4.5 USM ×	Tokina 19-35mm f/3.5-4.5 AF 193 ×
Filter Size (mm)	77	77
Aperture (f)	3.50 - 27.00	3.50 - 22.00
Closest Focus (m)	0.34	0.25
Magnification Ratio (x)	0.13	-
Type	Wide Zoom	Wide Zoom
Focus Details	Inner focusing; full-time manual focus and USM;	Internal
APS Equivalent	32 - 56mm	1.5x: 28.5 - 52.5mm; 1.6x: 30.4 - 56mm
Diameter (mm)	83.5	82
Image Circle	35mm	35mm
Focal Length (mm)	20.00 - 35.00	19.00 - 35.00
Brand	Canon	Tokina
Name	Canon EF 20-35mm f/3.5-4.5 USM	Tokina 19-35mm f/3.5-4.5 AF 193
Weight (g)	340	390
Diagonal Angle of View (degree)	63.00 - 94.00	63.50 - 98.70
Diaphragm Blades	5	6
Zoom System	Rotary	Rotary; Internal
Length (mm)	68.9	80
Notes	-	Available AF Mounts: Canon, Minolta, Nikon, Pentax
Lens Construction	12 elements in 11 groups	13 elements in 11 groups