Comparison of Sigma 24-70mm f/2.8 DG OS HSM Art and Tokina 24-70mm f/2.8 AT-X PRO FX SD

Attribute	Sigma 24-70mm f/2.8 DG OS HSM Art ×	Tokina 24-70mm f/2.8 AT-X PRO FX SD ×
Notes	Available AF Mounts: Sigma SA, Canon EF, Nikon F; Image Stabilized; Mount with dust- and splash-proof design; Compatible with Mount Converter MC-11	Available AF Mounts: Canon EF, Nikon F
Magnification Ratio (x)	0.21	0.21
Filter Size (mm)	82	82
Length (mm)	107.6	107.5
Closest Focus (m)	0.37	0.38
Diagonal Angle of View (degree)	34.30 - 84.10	34.49 - 84.20
Focus Details	Internal focus; HSM with full-time manual override	SDM; Internal with Focus Clutch mechanism
Focal Length (mm)	24.00 - 70.00	24.00 - 70.00
APS Equivalent	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm
Brand	Sigma	Tokina
Image Circle	35mm	35mm
Name	Sigma 24-70mm f/2.8 DG OS HSM Art	Tokina 24-70mm f/2.8 AT-X PRO FX SD
Weight (g)	1020	1010
Type	Standard Zoom	Standard Zoom
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Diaphragm Blades	9	9
Diaphragm Blades Type	rounded	-
Lens Construction	19 elements in 14 groups, including 4 aspherical and 3 SLD elements	15 elements in 11 groups, including 3 all-glass molded aspherical and 3 super low dispersion (SD) glass elements
Zoom System	Rotary	Rotary
Diameter (mm)	88	89.6