Comparison of Canon EF 24-70mm f/2.8L USM and Sigma 24-70mm f/2.8 DG OS HSM Art

Attribute	Sigma 24-70mm f/2.8 DG OS HSM Art ×	Canon EF 24-70mm f/2.8L USM ×
Diagonal Angle of View (degree)	34.30 - 84.10	29.00 - 74.00
Filter Size (mm)	82	77
Aperture (f)	2.80 - 22.00	2.80 - 22.00
Closest Focus (m)	0.37	0.38
Magnification Ratio (x)	0.21	0.16
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	-
Type	Standard Zoom	Standard Zoom
APS Equivalent	1.5x: 36 - 105mm; 1.6x: 38.4 - 112mm	38 - 112mm
Diaphragm Blades	9	8
Image Circle	35mm	35mm
Focal Length (mm)	24.00 - 70.00	24.00 - 70.00
Brand	Sigma	Canon
Name	Sigma 24-70mm f/2.8 DG OS HSM Art	Canon EF 24-70mm f/2.8L USM
Weight (g)	1020	950
Zoom System	Rotary	Rotary
Lens Construction	19 elements in 14 groups, including 4 aspherical and 3 SLD elements	16 elements in 13 groups, including 3 asperical elements and 1 UD element
Diameter (mm)	88	83.2
Length (mm)	107.6	123.5
Diaphragm Blades Type	rounded	-
Focus Details	Internal focus; HSM with full-time manual override	Full-time manual focus and USM