Comparison of Canon EF 100-400mm f/4.5-5.6L IS II USM and Sigma 50-500mm f/4.5-6.3 DG OS HSM APO

Attribute	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO ×	Canon EF 100-400mm f/4.5-5.6L IS II USM ×
Aperture (f)	4.50 - 22.00	4.50 - 40.00
Filter Size (mm)	95	77
Notes	Image Stabilized. Available AF Mounts: Canon, Nikon, Pentax, Sigma, Sony. Included Accessories: Case, Lens Hood LH1030-01, Step-down Ring, Shoulder S	Improved Image Stabilization with 3 modes and up to 4 stops correction; Dust and water resistant; Includes lens hood, tripod mount and case.
Closest Focus (m)	1.8	0.98
Magnification Ratio (x)	0.32	0.31
Zoom System	Rotary with lock	Rotary
Type	Telephoto Zoom	Telephoto Zoom
APS Equivalent	1.5x: 75-750mm; 1.6x: 80-800mm	160 - 640mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	50.00 - 500.00	100.00 - 400.00
Brand	Sigma	Canon
Name	Sigma 50-500mm f/4.5-6.3 DG OS HSM APO	Canon EF 100-400mm f/4.5-5.6L IS II USM
Weight (g)	1970	1640
Diaphragm Blades Type	rounded	rounded
Lens Construction	22 elements in 16 groups, including 4 SLD elements	21 elements in 16 groups, including 1 Flourite and 1 Super UD element; Air Sphere Coating (ASC)
Diagonal Angle of View (degree)	5.00 - 46.80	6.20 - 24.00
Length (mm)	219	193
Diameter (mm)	104.4	94
Focus Details	Internal; HSM with full-time manual override	Inner focusing; Full-time manual focus and USM; Focus limiter switch; High-speed CPU and optimized AF algorithms