Comparison of Sigma 24-70mm f/2.8 EX DG Macro and Tokina 28-70mm f/2.8 AT-X 287 AF PRO SV

Attribute	Sigma 24-70mm f/2.8 EX DG Macro ×	Tokina 28-70mm f/2.8 AT-X 287 AF PRO SV ×
Filter Size (mm)	82	77
Notes	Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax	Available AF Mounts: Canon, Minolta, Nikon, Pentax; Included Accessories: Lens Hood, Fitted Soft Case
Closest Focus (m)	0.4	0.7
Magnification Ratio (x)	0.26	0.2
Type	Standard Zoom	Standard Zoom
Length (mm)	115.5	108
APS Equivalent	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm	1.5x: 42 - 105mm; 1.6x: 44.8 - 112mm
Zoom System	Rotary	Rotary
Image Circle	35mm	35mm
Focal Length (mm)	24.00 - 70.00	28.00 - 70.00
Brand	Sigma	Tokina
Name	Sigma 24-70mm f/2.8 EX DG Macro	Tokina 28-70mm f/2.8 AT-X 287 AF PRO SV
Weight (g)	715	719
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Diaphragm Blades	9	8
Diagonal Angle of View (degree)	34.30 - 84.10	34.33 - 75.33
Lens Construction	14 elements in 13 groups, including 3 aspherical and 2 SLD elements	16 elements in 12 groups
Diameter (mm)	88.6	84
Focus Details	Internal with Dual Focus mechanism	Internal with Focus Clutch mechanism