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

Attribute	Canon EF 70-200mm ƒ/2.8L USM ×	Sigma APO 70-200mm f/2.8 EX DG HSM ×
Filter Size (mm)	77	77
Aperture (f)	2.80 - 32.00	2.80 - 32.00
Closest Focus (m)	1.5	1.8
Magnification Ratio (x)	0.16	0.13
Type	Telephoto Zoom	Telephoto Zoom
Focus Details	Inner focusing; full-time manual focus and USM	Internal; HSM with full-time manual override
APS Equivalent	112 - 320mm	1.5x: 105 - 300mm; 1.6x: 112 - 320mm
Diameter (mm)	84.6	86.2
Image Circle	35mm	35mm
Focal Length (mm)	70.00 - 200.00	70.00 - 200.00
Brand	Canon	Sigma
Name	Canon EF 70-200mm ƒ/2.8L USM	Sigma APO 70-200mm f/2.8 EX DG HSM
Weight (g)	1310	1270
Diagonal Angle of View (degree)	12.00 - 34.00	12.30 - 34.30
Diaphragm Blades	8	9
Zoom System	Rotary	Rotary with lock; Internal
Length (mm)	193.6	184
Notes	-	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax
Lens Construction	18 elements in 15 groups, including 4 UD elements	17 elements in 14 groups, including 4 SLD elements