Comparison of Canon EF 600mm ƒ/4L IS II USM and Canon EF 200-400mm f/4L IS USM Extender 1.4X

Attribute	Canon EF 600mm ƒ/4L IS II USM ×	Canon EF 200-400mm f/4L IS USM Extender 1.4X ×
Aperture (f)	4.00 - 32.00	4.00 - 32.00
Filter Size (mm)	52	52
Notes	Image Stabilization (up to 4-stops), includes new Mode 3 that activates IS only when the shutter button is fully pressed.	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
Closest Focus (m)	4.5	2
Magnification Ratio (x)	0.15	0.15
Diaphragm Blades Type	-	circular
Type	Telephoto Prime	Telephoto Zoom
APS Equivalent	960mm	320 - 640mm
Diaphragm Blades	9	9
Image Circle	35mm	35mm
Focal Length (mm)	600.00	200.00 - 400.00
Brand	Canon	Canon
Name	Canon EF 600mm ƒ/4L IS II USM	Canon EF 200-400mm f/4L IS USM Extender 1.4X
Weight (g)	3920	3620
Diagonal Angle of View (degree)	4.20	6.20 - 12.00
Lens Construction	16 elements in 12 groups (Fluorite: G2 and G4, UD Lens: None)	25 elements in 20 groups (incl. 1 rear filter); one fluorite and four UD lens elements
Diameter (mm)	168	128
Length (mm)	448	366
Zoom System	-	Rotating
Focus Details	Inner 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