Comparison of Canon EF 70-200mm f/2.8L IS III USM and Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO

Attribute	Canon EF 70-200mm f/2.8L IS III USM ×	Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO ×
Aperture (f)	2.80 - 32.00	2.80 - 22.00
Filter Size (mm)	77	77
Notes	Image stabilization with up to 3.5 stops of correction (CIPA); Dust and moisture resistant.	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Petal-type Hood (LH850-02), Hood Adapter, Tripo
Closest Focus (m)	1.2	1.4
Magnification Ratio (x)	0.21	0.13
Zoom System	Rotary	Rotary with lock; Internal
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	112 - 320mm	1.5x: 105 - 300mm; 1.6x: 112 - 320mm
Diaphragm Blades	8	9
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Canon	Sigma
Name	Canon EF 70-200mm f/2.8L IS III USM	Sigma 70-200mm ƒ/2.8 EX DG OS HSM APO
Weight (g)	1440	1430
Diaphragm Blades Type	rounded	rounded
Lens Construction	23 elements in 19 groups, including 1 flourite element and 5 UD elements; Air Sphere coating; Fluorine coating	22 elements in 17 groups, including 3 SLD and 2 FLD elements
Diagonal Angle of View (degree)	12.00 - 34.00	12.30 - 34.30
Length (mm)	199	197.6
Diameter (mm)	88.8	86.4
Focus Details	Internal; Ultrasonic Motor (USM) with full-time manual focus; Focus limit switch	Internal; HSM with full-time manual override