Comparison of Canon EF 100-400mm f/4.5-5.6L IS II USM and Sigma 120-400mm f/4.5-5.6 DG OS HSM APO

Attribute	Sigma 120-400mm f/4.5-5.6 DG OS HSM APO ×	Canon EF 100-400mm f/4.5-5.6L IS II USM ×
Notes	Optically Stabilized; Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony	Improved Image Stabilization with 3 modes and up to 4 stops correction; Dust and water resistant; Includes lens hood, tripod mount and case.
Magnification Ratio (x)	0.24	0.31
Filter Size (mm)	77	77
Length (mm)	203.5	193
Closest Focus (m)	1.5	0.98
Diagonal Angle of View (degree)	-	6.20 - 24.00
Focus Details	Internal, with HSM	Inner focusing; Full-time manual focus and USM; Focus limiter switch; High-speed CPU and optimized AF algorithms
Focal Length (mm)	120.00 - 400.00	100.00 - 400.00
APS Equivalent	1.5x: 180 - 600mm; 1.6x: 192 - 640mm	160 - 640mm
Brand	Sigma	Canon
Image Circle	35mm	35mm
Name	Sigma 120-400mm f/4.5-5.6 DG OS HSM APO	Canon EF 100-400mm f/4.5-5.6L IS II USM
Weight (g)	1750	1640
Type	Telephoto Zoom	Telephoto Zoom
Aperture (f)	4.50 - 22.00	4.50 - 40.00
Diaphragm Blades	9	9
Diaphragm Blades Type	-	rounded
Lens Construction	21 elements in 15 groups, including 3 SLD elements	21 elements in 16 groups, including 1 Flourite and 1 Super UD element; Air Sphere Coating (ASC)
Zoom System	Rotary	Rotary
Diameter (mm)	92.5	94