Comparison of Canon EF 400mm f/4 DO IS USM and Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports

Attribute	Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports ×	Canon EF 400mm f/4 DO IS USM ×
Aperture (f)	4.50 - 32.00	4.00 - 32.00
Filter Size (mm)	105	52
Notes	Optical Image Stabilization (4 stops); Available AF Mounts: Sigma SA, Canon EF, Nikon F	Image Stabilization
Closest Focus (m)	2.6	3.5
Magnification Ratio (x)	0.3	0.12
Diaphragm Blades Type	rounded	-
Type	Telephoto Zoom	Telephoto Prime
APS Equivalent	1.5x: 90 - 900mm; 1.6x: 96 - 960mm	640mm
Diaphragm Blades	9	8
Image Circle	35mm	35mm
Focal Length (mm)	60.00 - 600.00	400.00
Brand	Sigma	Canon
Name	Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports	Canon EF 400mm f/4 DO IS USM
Weight (g)	2700	1940
Diagonal Angle of View (degree)	12.30 - 34.30	6.20
Lens Construction	25 elements in 19 groups, including 1 SLD and 3 FLD elements	17 elements in 13 groups, including 1 flourite and 1 DO element
Diameter (mm)	120.4	128
Length (mm)	268.9	233
Zoom System	Rotary, with zoom lock switch	-
Focus Details	Internal; HSM with full-time manual override; Focus mode and limit switches	Inner focusing; full-time manual focus and USM