Comparison of Canon EF 24-70mm ƒ/4L IS USM and Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM

Attribute	Canon EF 24-70mm ƒ/4L IS USM ×	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM ×
Aperture (f)	4.00 - 22.00	2.80 - 22.00
Filter Size (mm)	77	72
Notes	Hybrid Image Stabilization up to 4 stops; Macro function; Dust and moisture resistant	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony
Closest Focus (m)	0.38	0.22
Magnification Ratio (x)	0.7	0.37
Zoom System	Rotating	Rotary with lock
Type	Standard Zoom	Standard Zoom
APS Equivalent	38 - 112mm	1.5x: 25.5 - 105mm; 1.6x: 27.2 - 112mm
Diaphragm Blades	9	7
Image Circle	35mm	APS-C
Focal Length (mm)	24.00 - 70.00	17.00 - 70.00
Brand	Canon	Sigma
Name	Canon EF 24-70mm ƒ/4L IS USM	Sigma 17-70mm ƒ/2.8-4 DC Macro OS HSM
Weight (g)	600	535
Diaphragm Blades Type	rounded	rounded
Lens Construction	15 elements in 12 groups, including 2 asperical and 2 UD elements	17 elements in 13 groups, including 1 ELD and 3 aspherical elements
Diagonal Angle of View (degree)	34.00 - 84.00	20.20 - 72.40
Length (mm)	93	88.9
Diameter (mm)	83.4	79
Focus Details	Internal; USM with AF/MF switch	Internal, with Hyper-Sonic Motor; AF/MF switch