Comparison of Canon EF 400mm ƒ/2.8L IS II USM and Canon EF 600mm f/4L IS USM

Attribute	Canon EF 600mm f/4L IS USM ×	Canon EF 400mm ƒ/2.8L IS II USM ×
Magnification Ratio (x)	0.12	0.17
Filter Size (mm)	52	52
Focus Details	Inner focusing; full-time manual focus and USM	Inner focusing; Ultra-sonic Motor (USM), AF/PF/MF switch, Focus Preset, Range Limiter
Closest Focus (m)	5.5	1.7
Lens Construction	17 elements in 13 groups, including 1 flourite, 2 UD elements	16 elements in 12 groups
Length (mm)	456	343
Focal Length (mm)	600.00	400.00
Diaphragm Blades Type	-	rounded
Brand	Canon	Canon
Image Circle	35mm	35mm
Name	Canon EF 600mm f/4L IS USM	Canon EF 400mm ƒ/2.8L IS II USM
Weight (g)	5360	3900
Type	Telephoto Prime	Telephoto Prime
Notes	Image Stabilization	Image Stabilization (4-stops); Included Accessories: lens hood and hard case.
APS Equivalent	960mm	640mm
Aperture (f)	4.00 - 32.00	2.80 - 32.00
Diaphragm Blades	8	9
Diagonal Angle of View (degree)	4.20	6.20
Diameter (mm)	168	163