Comparison of Canon EF 200-400mm f/4L IS USM Extender 1.4X and Sigma APO 500mm f/4.5 EX DG HSM

Attribute	Canon EF 200-400mm f/4L IS USM Extender 1.4X ×	Sigma APO 500mm f/4.5 EX DG HSM ×
Notes	Built-in 1.4x extender (8 elements in 4 groups) switches to 280-560mm f/5.6 lens with 0.21x / 1.48 magnification ratio; 4-stop Image Stabilization	Available AF Mounts: [HSM version]: Sigma, Canon, Nikon; [w/o HSM]: Minolta, Pentax
Magnification Ratio (x)	0.15	0.13
Filter Size (mm)	52	46
Length (mm)	366	350
Closest Focus (m)	2	4
Diagonal Angle of View (degree)	6.20 - 12.00	5.00
Focus Details	Inner focusing; Full-time manual focus and ring USM; Ring USM, High-speed CPU and optimized AF algorithms; Power Focus mode; Focus Limiter	Internal; HSM with full-time manual override
Focal Length (mm)	200.00 - 400.00	500.00
APS Equivalent	320 - 640mm	1.5x: 750mm; 1.6x: 800mm
Brand	Canon	Sigma
Image Circle	35mm	35mm
Name	Canon EF 200-400mm f/4L IS USM Extender 1.4X	Sigma APO 500mm f/4.5 EX DG HSM
Weight (g)	3620	3150
Type	Telephoto Zoom	Telephoto Prime
Aperture (f)	4.00 - 32.00	4.50 - 32.00
Diaphragm Blades	9	9
Diaphragm Blades Type	circular	-
Lens Construction	25 elements in 20 groups (incl. 1 rear filter); one fluorite and four UD lens elements	12 elements in 9 groups, including 2 ELD elements
Zoom System	Rotating	-
Diameter (mm)	128	123