Comparison of Canon EF 800mm f/5.6L IS USM and Canon EF 200-400mm f/4L IS USM Extender 1.4X

Attribute	Canon EF 800mm f/5.6L IS USM ×	Canon EF 200-400mm f/4L IS USM Extender 1.4X ×
Notes	Image Stabilization	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
Aperture (f)	5.60 - 32.00	4.00 - 32.00
Magnification Ratio (x)	0.14	0.15
Filter Size (mm)	52	52
APS Equivalent	-	320 - 640mm
Type	Telephoto Prime	Telephoto Zoom
Diaphragm Blades	8	9
Diameter (mm)	162	128
Image Circle	35mm	35mm
Focal Length (mm)	800.00	200.00 - 400.00
Brand	Canon	Canon
Name	Canon EF 800mm f/5.6L IS USM	Canon EF 200-400mm f/4L IS USM Extender 1.4X
Weight (g)	4500	3620
Diaphragm Blades Type	circular	circular
Lens Construction	18 elements in 14 groups, including 1 UD, 1 Super-UD-glass and 2 fluorite elements	25 elements in 20 groups (incl. 1 rear filter); one fluorite and four UD lens elements
Diagonal Angle of View (degree)	3.08	6.20 - 12.00
Focus Details	Internal focusing; full-time manual focus and USM	Inner focusing; Full-time manual focus and ring USM; Ring USM, High-speed CPU and optimized AF algorithms; Power Focus mode; Focus Limiter
APS-C Equivalent	1280mm	-
Length (mm)	461	366
Zoom System	-	Rotating
Closest Focus (m)	6	2